>>6777171Yamato went through several iterations of the 1/60 VF-1, but they're primarily grouped into versions known as v1 and v2.
At the time, the v1 was a big leap forward in terms of sculpting/detail for a VF-1 toy, but it had a lot of issues. Chief among them was that you had to remove the legs in order to transform the toy, and the toy didn't hold together that well. There were also numerous niggling QC issues (ie gunpods that would not sit straight when stowed in fighter mode, wings that would not close all the way in battroid etc.), nearly all the major details were mediocre quality stickers you had to apply yourself (ie the UN Spacy kite emblems on the nose, wings), and the sculpt still didn't look quite right in any mode besides fighter. Personally, I hated the v1. The ones I bought had every QC issue in the book and were simply not fun toys; it made me swear off Yamato as a company for a while, heh.
The v2 was a quantum leap forward. The sculpt was FAR superior, and most importantly the transformation was now truly "perfect," meaning nothing was removed or swapped around when transforming. Details were now tampo printed, and it was just a better toy in every way imaginable. The v2 did have issues, though, and the v2 underwent many revisions before all the issues were ironed out. The most serious issue with early revisions of the v2 was that the shoulder joints were highly prone to breakage ("highly prone" as in like guaranteed to break). This was a materials issue that was resolved fairly quickly, but it means you need to avoid early v2s.
Anymoon's extensive v2 review has some images just above the "Charm & Collectability" section that details which v2 releases you must avoid, as well as some further explanations about differences between v2 iterations.
http://anymoon.com/blog/?p=4599 