Currently I use a valve index! This is actually the second index I've owned, I only replaced the last one fairly recently because it stopped working and it was falling apart badly anyways (lasted 3 years under my ownership though and it's had at least 2 owners before me).
The controllers have been a little broken since I got the headset though and within the last month the right one's battery has completely gone out on me and I dont really have the expendable income to replace it rn :( I also have three Vive 3.0 trackers for FBT and have loved them!
A very recent addition has been eyetracking! I did the ETVR mod on my index (the gumstick mod specifically). TL;DR, its kinda a hassle but its cool, mine is very janky tho and I wouldnt recomend if you don't already have an index and know the risks (it's also pretty uncomfortable?). I haven't had many opportunities to show it off but I really should it was a lot of work...
I never plug this, but I am CURRENTLY working on a video that covers this mod so if people wanna I'll post that on my YouTube once I'm done.







