Just wanted to add another voice to this. The V Collection would be greatly enhanced by consistent microtuning support across the board, making it usable for people working with nonstandard tunings or wanting to play with instruments that can't be retuned.
Personally I'm unlikely to be able to justify the cost until that happens, since the number of projects I could use the V Collection in is limited by this factor.
It should be a fairly modest development task if the synths all share common code for mapping MIDI notes to frequencies.
[UPDATE: After playing around with the demos of these a bit, it looks to me like they've all been developed separately and I doubt microtuning can be retrofitted in a convenient way. I'd be pleased to be wrong but it's probably too much of an ask. That's a real shame. I'm still considering picking up the Farfisa; it has +/- 50c tuning, which is adequate for some applications, and it really sounds beautiful. The Vox has the same feature. None of the others support anything more refined than global tuning as far as I can see.]