Absolutely no worries mate, glad I could help.
Tbh, I don't feel it makes it look messy or cramped buddy! I think your idea of getting one and trying it is a good one.
The mirror back insert was on display at my local store along with the dioders mounted behind the glass shelves. I absolutely fell in love with it at first sight. But that night I went with the intention of buying 3 inreda light sets, so I bought those, but I just couldn't get the sight of the mirror back / dioder display out of my head
so I got home, set up 1 of the inreda lights and whilst it was cool, it didn't beat the mirror back / dioder display for me. So the next night I went back and got a refund for the inreda lights and bought 3 mirror back inserts and 2 packs of dioders.
But I actually should have kept the inreda lights because there isn't a great deal of light shining down onto the figures from the front when you have only dioders mounted behind each shelf.
It's costly all in all but well worth it.
I'm really wanting to get pictures of my collection up, mate. Just a few more pieces to arrive and a little straightening up and I'll do it, I think!