buy, buy, buy!!!
afaik, the exploding shoulders on the 1st release of the 0A and S have been addressed/fixed with the reissues so you're good there.
as far as the 2 VF-1s you like, the VT-1 reportedly still has the knurled shoulder pins that might make it susceptible to the hinges cracking, but based on what i've read here, it has been rare. what i don't know is if the ones hlj is selling now are reissues and not part of the 1st release. if they're reissues, the issue with the shoulder pins might've been already fixed.
for the VF-1S tv roy, you have nothing to worry about, as this valk already has the smooth shoulder pins installed in them.
hope this helps!