Biggest metal kit I've ever made. Instructions were easy to read, although some steps had mislabeled parts, saying part x would be in bag N when it would actually be in bag F etc. Pretty easy to figure out though. No missing parts, but also not many spares, so don't lose them.
Part quality is very good, only had 2 parts breaks out of several thousand, and only because I tightened them too much, and was able to just glue them together after.
Only complaint was that some steps required a lot of strength to put together, mainly the ball joints in the chest, which does make sense as they do need to support the weight of everything. Also one of the steps for the head was really annoying to do, having to align 20 or so parts at once that would fall out of place before being screwed in if you breathed on it wrong. That was the hardest part of the whole build, and the instructions make you do the head first (apart from the stand) so watch out for that.

Big challenge, lot of fun.

This is the most amazing kit I have ever seen. The manual itself is a work of art and lavishly illustrated on thick, glossy paper. The materials are of high quality and fit together without too much effort. The sheer number of parts is mind-boggling, which brings me to a few suggestions that would improve the user experience.

First of all, the parts organization is nuts. There are literally hundreds of bags within two dozen larger bags. Just finding the correct part is time-consuming. It would have been better to have sorted the parts by step number. I've done several kits with this arrangement, and it saves a lot of time. You never have to experience the frustration of mixing up W2-X34-ZZ with W2S-X34-ZZ and have to go on yet another bag hunt.

Second, there is a lot of precision metal-bending in this kit, and my first attempts were not good. The kit should include a few pieces of scrap metal so users can practice making bends. I have hitherto only worked with the thin type of metal that comes in kits like Piececool and Metal Earth. The metal in this kit is substantially heavier and I am having trouble finding the right technique to best form the correct angles. I am only a few steps in and managed to break a part. I have asked for a replacement and hope it will ship soon. Note that the metal is unforgiving and you cannot re-bend it if you make a mistake.

A practice metal scrap would be especially helpful because the first assembly step (excluding the stand) is the face, and ruining that would be very sad.

The designers put a huge amount of thought into making this kit. I hope I will be able to finish it.