I forgot to post back but I’ve been riding an Eagle 10-52 on my spare wheels with my T-Type for the past week and it has been perfectly fine. Maybe slightly less crisp, but if I didn’t know I was running a different cassette I don’t think I could feel the difference.
It was a simple as putting cassette spacer ring ok (one of the ones that comes with every cassette) and everything else just works.
I’m happy to hear this! I’ll give it a shot with my 2nd wheel (some day)
I ended up getting the used epic evo off of eBay. It was in new condition (rotors new, chain still had the factory lube, tires had the nubs, etc.) so that was a nice surprise. I’m using my eagle XX1 cranks with the quark powermeter and a race face narrow/wide 32t ring. It’s a 52 (ish?) mm chainline so…narrower.
Installing the group was ridiculously easy and has shifted perfectly from the very first press of the button. For me it’s a game changer. The damn thing shifts so well! You just press the button, no easing up, no “pushing the lever just right”, no nothing, just great shifts. I can understand why somebody would want to say with cable…but for me there is no question that this works better the way I’m using it.
Not really sure if the evo is “better” than the Izzo but they are both up and running with power meters so I hope to get some head to head laps in the next week or two to see if there is a speed difference. I’ve run the Izzo, a canyon spectral, and a 2018 spec epic hard tail on my test lap and with the same tires they all run at the same speed. They don’t feel like they are running at the same speed though!!
Joe
I’m late to this, but my experience is the same as @djwalker1260 . I’ve swapped wheel sets even (same hub), but I’ve removed the rear wheel, changed the cassette over to a different rear wheel, and had no shifting problems. Maybe I’m just lucky though…
Yeah I have come to the conclusion something is likely off and have reached out to their customer service. My group set is XO (version 1) and was installed by a shop but it never ran correctly. Took it to the SRAM tent at Sea Otter and said everything was “normal” but to go through the install process again. So I did… retorqued everything and got it to be acceptable but EVERYTHING has to be perfect and exact. Could be something is slightly bent on the derailleur or somewhere else (initially it was running into the cassette).
Regardless I just bend my hanger on my mechanical 
and barely made it back home with the chain constantly slipping. Maybe a bit of noise is better than that.
Yeah, I had a problem with my first install of GX TX. It just refused to do a single shift on the 9 gear (4th from the 10-tooth). I could shift beyond it and then back to it, but it never made the single step.
I took it back to the shop that did the original install, and they just went through the setup process as if it was brand-new, and then it worked from then on!
Apparently it’s very finicky about the starting position for the setup.