I have the Perfect Master pack. I honestly can't say much about it though because I got it years ago, opened it, and just put it aside because it wasn't what I thought it was going to be. I was naive and thought they would automatically sound amazing out of the box. (Not that they were bad, I just didn't find them necessarily higher quality than free, popular high quality UTAU.) Also I remember I had a heck of time getting Mitsuko to work for some reason, although I think that was because of my inexperience (and possible UTAU Synth incompatibility because I'm pretty sure I was still using Mac... but mostly inexperience).
I still think they could be worth it if you're serious about using UTAU and really like the banks. The tutorials in the magazine were kind of nice. I'm still tempted to get the starter pack. I probably would have been more satisfied if I hadn't had to pay a forwarding charge that cost almost twice what the magazine originally did.