No problems here with P7 working with mil figures including V4. It renders faster with better lighting and I find it quite stable for the first go round. I have noticed that many of the complaints are user faults and not the software. Not all, but many are. The turn off external morphs was a problem in P6 too, IIRC, so nothing new there.

I only have P6 installed for testing and python scripts that have not been updated yet. I open P7 first.

Now there is the P7 Carrara issues. Looks like there won't be a P7 update in Carrara so P6 is need for that, but if you use Vue6 nothing to worry about, once the kinks are ironed out. I heard the SR1 is to be sometime in Feb.

The only advice I would give is don't let the few complaints stop you from buying P7 if you really want it. There will alway be someone that will complain that the problem is Poser and not them.
You know the old story, The cat died and it's that crapy software Poser's fault because I forgot to feed the cat, thingy.