Lots of good information here, thanks all. I'd forgotten about the IR brightness and never really thought about the fact you only need them if you're using reflectors (hat).
When I first got TIR many years ago, I also bought the TrackClip Pro. I don't know why, I guess I thought it would be better. My experience with it was that sometimes my face would shade it when I turned my head in the direction that the mic boom was on, and my view would freeze for a second. I think it only takes one of the Iights to be blocked for this to happen. I think this is more likely to happen if you have a big screen. I also preferred not having that extra wire that needs to be routed to a USB port for power. I can see why people all have different preferences, since the environments that they play in are so varied. Everybody needs to optimize their equipment for the situation that they're in.
I also wear glasses, and like Hess, have a pair that is a fixed magnification for flying instead of my progressive lenses that I wear the rest of the day. My flying glasses are just cheap reading glasses that have no special coatings that I know of. I don't know why but I've never had a problem with them reflecting IR back into the camera. Maybe it's the angle the camera is aimed at? I would think this might be more possible if your camera is directly in line with your eyeglasses.
Luckily I've never had a problem with the hat clip. My computer room is an ideal situation because it has no windows , and it has wall-mounted lights. I've unscrewed the bulb on the one that's directly behind me.
I'm very lucky because I've never had any kind of failure ever on my TIR. I've had a 4 and now a 5. I hope your problems are solved soon, Hess!