I bag two of these. One is seasoned, the other newer. I use them for both putting and throwing.

I like the Envy because I feel that the heaviness and electron firm plastic make it more forgiving to small form deviations while putting.

The newer one flies dead straight with a mild but dependable fade (around 220ft or less)

The seasoned one flies similar but with a smidge of turn. 

They both fly very neutral and hold slight anhyzer lines well. I plan to keep these in my bag for the long term.

To me a putting putter is 75% of how a disc feels in your hand. For my hands the envy is prefect. I use to putt with Wizards, and I found by switching to the envy (originally an upshot/driving putter) just bumped my game up so much more. Sold the Wizards and bought 10 envy firms to practice with.
I love the envy so much I had to get it in all its plastics. So JC Electron Firm is by far my favorite. I like it's flight with its mild turn and moderate fade. Next would be Electron Soft, which has a touch more turn and glide, and a soft cushion so I use this disc a lot for my upshot or C2 Putting. The Eclipse 2.0 version is has a touch less turn then the Firm, less glide, and more Fade. I like this disc on windy days for longer putts, its durable and stable which makes it predictable. The Plasma version on the putter made it more stable then Neutron Soft. The Cosmic Neutron is most stable version. 

The envy has become my go to throwing putter brand new it cab handle the wind really well once seasoned it becomes a great tool for tight fairways as it's point and shoot. I highly recommend the envy for anyone looking for a trustworthy throwing putter.

The Axiom Envy is a lovely disc! It does its best work when it is thrown at a high speed down fairways. It has a nice, consistent flight path, and tends to sort of drop out of the air without fading or turning at the end of its flight! You can really launch this disc, and it won’t flip over! It’s a great disc to have for shots where you need something that will consistently fly straight and hold whatever line you give it. I’ve never thrown a putter that is more dedicated to holding the line it is given. This disc loves to be put on a hyzer line and will hold it to the ground. If you put it on an anhyzer line, it wants to work for you and keep that line as well! When you put it on anhyzer, it holds the line well, and then slowly drifts to flat if given enough space. If you don’t put much power into it, it can be a great around the corner disc. Or if you are simply looking for an overstable approach disc, it tends to bite and stick where it lands. As far as actually using this disc for putting, I don’t know that I would. I’d go with something more like an MVP Nomad, or even an Axiom Proxy. But that’s just me, and the way it feels in my hand. I think most people who pick up this disc are getting it with the purpose of using it as an approach disc anyways.

The envy is my all time favorite disc and easily the best throwing putter I've ever used. It has so much versatility. I currently bag three with a fourth one that's trying to sneak in. The neutron envy is the perfect amount of overstable that it will be reliable and you always know where it's going to land, but it never feels like it's going to dump out. Electron soft envies beat in to super understable which makes it perfect for touch upshots and hyzer flips. My electron firm envy is laser straight. I can put about 60 percent power and it will have no turn or fade.  I've even messed around with eclipse envies which are perfectly in between neutron and my electron firm. 
 

If you are ever looking for a new throwing putter please do yourself a favor and pick up an envy. It's the most comfortable and versatile disc in the game. Much like me you'll approach every single tee and ask yourself "Can I throw my envy here?" It gave me so much confidence that I never had with a slow disc before. 

Wish I would have tried an Envy sooner. Rim depth reminds me of the A series from Prodigy. Flat releases FH & BH flies straight with a dependable fade at the finish. BH anhyzer it will hold the line for a bit then fight out and hyzer out at the end. FH with too much torque it will ride the anhyzer to the ground. With some touch it will shape nicely finishing hyzer. BH & FH Hyzer it flips up & glides straight. After about 5 throws it made the bag as a hyzer flip approach disc. Don't care for it too much for actual putter from 30ish or less feet, but its an excellent approach disc.