Yeah. I have the same ambient light issue as Wing_Z, but since I got a VR set last November I solve it by playing VR whenever there is enough sun glare to confuse the tracker. Usually would be uncomfortable sitting and looking at the screen under those conditions anyway.
One thing Tobii has going for it is that it is a relatively new technology, and not something that essentially ceased being developed 10+ years ago like TrackIR. Tobii has been more successful in convincing AAA non-sim game publishers to implement support in recent installments of series such as Assassin's Creed, Far Cry, Hitman, Dying Light, etc. I'm a bit intrigued by this because I used to play those types of games more, until I decided that flight sims and the occasional driving sim are more fun than all other games. However, most of the reviews I am seeing are saying that Tobii is not very good with those non-sim games, and it is certainly not capturing much of the player base. So, in time, I imagine that support will dry up, and Tobii will remain a niche product for sim games, like TrackIR. It seems to show that players of those mainstream games, even though they value "immersion" as much as we do, don't find head tracking (or VR for that matter) to be necessary for it.
Tobii's price point doesn't bother me that much and I feel like it would be the way to go for someone who is new to any sort of tracking, but can't see it as a worthwhile upgrade from TrackIR.
August