I have two of the larger sized ones. They are pretty nice, but the price is a bit much considering you can get a Detolf case and add lighting for the same price, which has real glass, etc. Of course, the shelves are a bit smaller, but you can modify them pretty easily for larger things.
One of mine came with the USB connector pushed too far down in - so I had to open it up and fix it. It's actually rather easy to access - you remove the screw, take out the battery cover, and it basically just slides off. All that's in there is a tiny little circuit board, and two little wires going up to the USB connector. I slid it back into place, and closed it up. That part is easy to get to - but I have a feeling that if something was wrong going from the circuit board to the inside lights it would be more difficult (I didn't want to disassemble it any more, not sure if those foot pads can be removed, which may be hiding screws, and the whole thing able to be opened up or not).
The acrylic is nice quality - if you buy one of these, make sure you get some Novus plastic cleaner - you don't want to be using Windex or anything on this as it will discolor the acrylic over time. Novus stuff is cheap - you can just buy their #1 clean and shine, or the whole kit with all 3 products (used for scratch removal) which actually is the best deal - you can use it on anything plastic, from CD's to the interior of your car.
On that note, I figured out pretty quickly that you don't want to remove the sticky paper backing until you pretty much have the sucker fully assembled and in place, or you are going to have to start with a LOT of cleaning of fingerprints right off the bat. Basically, I pulled up the paper just enough on each end to be able to assemble it, and then didn't pull it all the way off until everything was in place. This made it much easier and saved a ton of time and annoyance.
The front panel is...iffy. It seems to rest on a spring-loaded mechanism. I'm a bit afraid how long that is going to last over time. Once you have the back and two sides assembled, you just push the front piece down, and then once it's in place the spring lifts it up and it reaches the top portion and it sort of suspends there.
My one real disappointment was that neither of the front panels I have actually sit flush - there is a small gap there on one side where the front doesn't perfectly meet the back. I think the spring is giving it too much pressure making it bow a bit. This means dust can enter - it's a small gap, and not really noticeable unless you are looking for it so visually it's fine, but it's not air tight. I've tried to come up with a few solutions for it, but nothing I can come up with to press them together would be acceptable visually, and/or would make it difficult to open it up later. I kept thinking some type of clip, but have yet to solve that one. For the price, I did expect it to truly be a closed environment. Since I have it on both of mine, bought at different times, I think it's a design flaw and not a one-off.
The lights are nice and bright, and very adjustable - and you can also remove some if you want. I have all 8 in each one, though sometimes depending on my mood I'll turn on the top or the bottom only. They would be easy to change out for different colors - if they actually made the colored lights available in a pack - it seems so far the only way to get them is if you buy one of the rotating stands. Initially it sounded like the rotating stands came with several different sets of different colors, and I was going to buy them just for that (the rotating stand would not work for the Premium Format figures I have in there). However, newer listings show one color choice - and that's too expensive to pay just to get more lights. They advertise how you can switch them out - would be nice if they sold the lights so we could, LOL.
Size-wise, I had no problem fitting the Premium Format Leia's in there (the white dress and slave). Obviously since she is shorter (about 16.5") there is plenty of space in the top. That said, I was worried that the Slave Leia wouldn't fit in there because of how far out her weapon goes, but she JUST fits in there without it touching the side. Basically, that's the limit of how wide it is - I could pretty much just slip a piece of thin paper between the tip of the staff and the side, and her base is nudged in between the two lights on the other side. I was a bit worried that she would look weird all off-center like that, but it actually looks pretty awesome, even displayed next to the other Leia which I do have centered in there.
To power it, I just got USB extenders ($5 each from Amazon) and thread them over to a USB hub. I love that they are completely hidden back there - I really hate the look of wires around displays, it really detracts to me. The cords that come with it are not going to be long enough for anything unless you just have one and the USB hub is right behind the display, so the extenders really are necessary.
Overall, pretty pleased - but yes, $100/whack with shipping was the most I would have paid to make them worth it. After getting these, though, I did cancel several 1/6 scale ones I had on order - they are only $10 cheaper and so many other options (namely, Ikea Detolf) just don't make them worth it at those prices, even if the lights look pretty cool. I don't plan on buying too many more Premium format figures unless they make more Leia's, but if I did, I would get another one of these if I could find them at a reasonable price. Depending on the price, I might look at some of the wider ones they are supposedly doing, but it's so hard to find information about what is coming out and when I haven't thought about it much and it will largely depend on price.
I give them a solid B+.