Reverb G2 is actually a fantastic headset.
Resolution is breathtaking, Audio is fantastic (same as Index)
Tracking is ehh but they did release a Revision which from what I've heard helped a shit ton.
I use Hybrid setup personally (Knuckles + FBT) and it can be a bit tedious but it's honestly worth it in my opinion.

Don't get the Index when you can get the Reverb G2 cheaper, the only downside is the tracking but like I said, supposedly it's been improved greatly with the latest revision, plus they also released an update to the WMR software so you can launch SteamVR directly and not deal with the WMR portal, tho it still runs in the background....However alongside the update they also released a new "home world" called the Infinite Expanse which is way more performance friendly.

Worst case you can just return it.