As a new Quest user (about 7 weeks now I think) the initial wow factor has settled down a bit. The positives are all still there - portability, immersion, ease of use etc. All the family love to have a short play and it's loads of fun for what it is. The reason I'm looking forward to the Reverb G2 is that I'm hoping to get the best of both worlds - keep the quest for the things that it does well, but have something which does the things it's not so good at.
For me, I spend 90% of my time in VR sitting in the same spot, which is in front of my steering wheel. What the quest doesn't do for me is:
Comfort. After half an hour I'm feeling it on my face. I can (and do) keep going but it is not the most comfortable and is very front-heavy. I've heard that the original reverb is significantly lighter, and is balanced a bit better across the whole of the head. I'd hope for similar with the G2.
Resolution. It's OK, and driving in VR is incomparable to driving with even triple screen setups. But it's not quite there for me and I find the lack of detail/sharpness very noticeable
Refresh rate. No big deal for driving games tbh, in some ways refreshing at 72hz is a benefit as I don't have to try to drive it to 90hz. However it's very noticeable on eleven table tennis, I'd love to play that game at 90hz or even 120 or 144hz.
I've had no problem with the tracking on the Quest, and have no experience of the lighthouses, but have no preference either way, other than obviously there would be an additional cost if I had to buy them.
So for me, assuming the G2 is somewhat more affordable than the index, and addresses each of the above (I know it will, as the current reverb does effectively this already), I'm very interested.