I have one, and both the 3/4finger extensions...
I have a love/hate relationship with mine!
It is also the only hinge release that I actually prefer as a 4 finger...Everything else I've shot feels/works best for me as a 3 finger!
It is easy to shoot/execute shots with, but it does feel a bit clunky/large in my hands compared to other releases I've owned/shot (as a reference; I have large hands, large/long fingers.)!
When I initially got it, it did chew up loops like it had an appetite for destruction! After a few hundred shots (500-1000!), it suddenly stopped chewing them up...Must've had a bur/machining marks that were hanging up and finally smoothed out (I checked and couldn't find such defects when it was going through loops!)...Maybe the D-loop eating demon that possessed the release moved on!
The hook is very short/stubby and can be a bit of a challenge to hookup, especially if you run shorter D-loops...You do get used to it, though!
Another issue I had was that the clicker stopped working after just a couple hundred shots...Evidently, this was a defect with the ledge on the initial run. Scott took care of me right away and shipped me a new moon w/in a week, so kudos to excellent Scott customer service! The clicker has been solid ever since!
I did shoot this release w/out the click for a while...Didn't care for that, as the release felt a little 'vague' to me, and not in a good 'surprise shot' sort of way (shot execution seemed inconsistent and the adjustments too hard to get 'just right'!), so I like using the click with this release just to get a good reference/starting point for aiming/shot execution.
What I like most about the release is that I've had my highest X-counts with this release! What I hate most...I've had my biggest misses with this release!
When I'm on, I can't miss the X! When I'm a little off, it could be in the red w/what felt like a shot that shouldn't have punished me that badly! All the other hinges I've owned/shot would still be 10 liners/solid 9's with the same shot!
I like that the release is a bit easier to execute when you're feeling pressure/anxiety, but at the same time, shooting in those situations have also resulted in some really big misses for me, whereas I haven't paid as big a price with other hinges!
My current favorite is my TRU Ball HBC, and my Carter 2Moons...I have the most consistent scores, less deviation/point loss, with less than perfect shot execution, with those releases...YMMV!
I have times where I contemplate selling/trading the Backspin, but I hang onto it...Don't really shoot it all that much anymore, but I do keep it in the bow case!
Remember though, a lot of archery is really personal, and one size does NOT fit all! This is especially true when it comes to release aids, none more so than hinges!