I've owned an Alto VF-25 renewal and Hikaru VF-1J v2.0 for about a year now.  
Love them... No issues. 
I just bought a 30th Ann Hikaru VF-1S and its FALLING APART!!! 
Little tabs are shearing off. A missile hard point came off. The leg swing bar doesn't "click" in and just falls out the door in Battroid mode so I can't transform it right!!!  
Since I actetone welded the hard point on the seller won't refund my $190(ish) or exchange it. I'm so mad I feel I have to stop collecting to avoid gambling my money on Yamato stuff. 
Is the the darker VF-1 line (which strangly feels a gram heavier) made of a brittle ABS plastic as opposed to my bright white and sturdy VF-1J?