I've no experience on a Zesty but I've tried a few options on a similar horsty-linky Nicolai Helius AM.
The bog standard Float R I had was pretty poorly controlled and would blow through it's travel unless I ran a higher pressure than I should have which meant about 20% sag. Blow through was improved by reducing the volume of the air chamber which is a cheap fix and allowed me to run 25-30% sag. When I had the Float R tuned and Pushed (at TFT's recomendation for my usage... I had the Float R very hot on a few big descents) the performance was much improved and I can run 35% sag, but it took them two goes as I was not happy first time round as the rebound was too slow and it felt bad.
The VIPr/Deville combo I tried felt better than my tuned Float R/36RC2 combo, and the VIPr was in many ways as good if not better than my CCDB (better for climbing... the CCDB is better for the doonhall).
What I feel the VIPr does better than my Float R or CCDB is maintain it's sag/position relative to what angle the bike is at, thus reducing the wallow and the dreaded blow through on techy climbs which upsets the balance of the bike - in much the same way as I found the Deville reduced brake/weight-shift dive when compared to my 36 Float RC2's. By tweaking my RC2's and increasing the rebound on my Float R (Rebound and HS Compression on my CCDB/36RC2) I have got a similar performance to the VIPr/Deville I tested.
I'm quite torn myself where I go from here... do I tune the Float R/36RC2 again or bite the bullet for a VIPr/Deville (EXPENSIVE). I like the CCDB and by fiddling with it I've been able to work out what improvements I would like on my Float R next time (more HS compression is the main thing...). This would make it feel more the like the VIPr which I really liked... so perhaps I should save up and buy the VIPr and Deville's later this year?
The one thing putting me off spending the cash on the VIPr/Deville is that I didn't get a chance to try them on the really big terrain I love... and a good friend of mine hated his Deville's on it and went back to 36 Floats. Tough decision ahead if I get the pennies together.
So... if you like/love the Deville I would say the VIPr would be a good decision, but as mentioned a tuned Float would get you most of the way there... but it could take a few go's, and would you be happy with it knowing it's not the VIPr... which is what you probably want