I only own a VF-11B non fast pack. I picked it up in Hong Kong last month because I was on vacation, and had always heard how yamatos were the best valkyries. Unfortunately, I didn't know about this site, or the problems with the hips. It broke on the plane ride back, before I had ever transformed it. Needless to say, this left a bad taste in my mouth. In replacing the toy enough to be able to transform it, I also noticed that several screw posts had white stress marks, which I would attribute to overtightening.
Since then, I've been interested in other yamato releases, especially the VF-0, but I can't help but think that some part is going to be messed up. On both the VF-0 and the yf-19, people are finding stress marks. What's the point of a perfect transformation plane if you can't transform it without it breaking?
Finally, some people said that you still don't see people selling off their yamatos, even after breakage. One thought could be that these are now next to worthless. I paid US $70 for the Vf-11, and it's not like I can recoup even half that if it has a broken hip.
The big problem is the price. If I pay $200 for something, I would expect it to hold together and not break. Stress marks turn into breaks in the long run. My conclusion so far is to wait 4-6 months and read the reports, but at that point, they're either rising in price or less available to me.