>>294643581
The index hardware issues are like this:
Controllers: 100% failure rate on the sticks. They literally just wear down super quick. More use = more wear, if you play VRFPS regularly expect less than 2 months out of a controller. 
Headset Cable: After about 8 months it breaks. Not entirely sure why, but finding a actual 'bit where it breaks' was nearly impossible when mine broke so I think it's wear and tear. 
Lighthouses: Very little issues. I think I've heard of 1 in total that needed RMA. Solid. 
Headset itself: Sometimes has issues, but rare. Mine works fine.