I got v6 with that sale they had (never pay full price). So far for me it's not exactly been a win. All the bugs v5 had are still there. The changes they made to how they stream and support hard drives is broken depending on your hardware. I tried working with them to get them to actually fix it but in the end they admitted it was broken but seemed to have no interest in actually fixing it. Wasted a ton of time for nothing. I think the wall between their support and their actual programmers is impenetrable.
V6 is nicer than v5 if you have a lot of instruments (like with their Cloud sub), but if you have just a small handful of libraries I'm not sure it's a big win.