I had to think long and hard, and read alot on the internet, before purchasing this one as there is no way to try it out beforehand where I live.
The reasons why I give it only 5 stars is because it deserves nothing less. I've had to send couple of emails to Novation regarding couple of things, and they always replied within 48 hours with very helpful information.
I had to choose between PEAK and DSI Rev2 due to my budget, and I'm very happy I didn't go for Rev2. The main reason? The VCF and audiorate modulation. Yes, alot of audiorate modulation in a poly synth! The FM is gorgeous, FM-ing the filter for some extra dirt is wonderful, and the FX are almost way too good to run PEAK through anything else. Oh, the ringmode is ace too! Plenty of clang! The oscillators are deep and moving, not sterile under any circumstances. Not that Rev2 isint perfectly good synthesizer too, but having 4 lfos with no delay/fade in/fade out is kind of weird, and I'd rather have 2x full featured lfos than 4x with less options.
The online community around the PEAK is also good and growing too so you won't be alone facing your problems, find the facebook group, alot of friendly people to help you out.
One last thing, i've not ran into any serious bugs yet, and that alone is very valuable as many hardware users should know. If you need a flexible sound designing polysynth with beautiful VCF, give PEAK a change. Seriously, that VCF is amazing.