Just seen this in person to a friend who got his one, it's outstanding. I've seen pretty much all XM pieces in person so far, and Thanos is surely the most impressive along with Magneto imho. Random impressions:
-portraits are amazing. Expressions, skin and lips texturing, eyes, they're spot on
-he's very very solid. His body alone weights more or less the same as Galactus' body. Base, arms, heads, gauntlets and shoulder pads are solid too
-paint app is spot on. I didn't notice rough lines except a minimal paint bleed in one of the corners of his costume. Note: the front of his costume has a black outline in the inside, it's made on purpose. I tried a bit, from about 2 inches far you can barely see the black outline, from 4 inches it's completely invisible. It blends with the shadow cast by the costume and the creases in the suit and adds some shading to the borders of the costume
-base is good enough. I've read a lot of critics about it but it's a good sculpt. Nothing over the top but it has some very nice detailing. If this is not a good base, I wonder how people classify bases like the X and A bases or the generic rocky terrains
-he is big, bulky and has a ton of presence
-cosmic cubes are awesome as are the gems in the gauntlet. They reflect light naturally so the lack of light up is absolutely unnoticeable
Now, it also had a pair of flaws that need to be mentioned:
-two of the three gauntlets had an unglued gem (both the green one), it's a super easy fix with a drop of glue but still, I've heard it happens a lot
-there was a gap of about 2 millimeters when we attached the left arm to the body. But note that the shoulder pauldron is a separate piece and once it gets attached, the gap is unnoticeable. The gap might be intentional to accomodate properly the shoulder pads - I'll check when I receive mine next week if he has the same issue or not
Btw, even considering these two flaws, imho this is one of the best statues of the year. I've seen many big beasts in person this year, Hulk XM, Lobo PF, Galactus Maquette... and Thanos is the absolute best.