I have heard good and bad things about them. There are a bunch of accounts of them breaking. Some folks will come in here and tell you that "my TLR1 is running fine" but it doesn't take much looking to find lots of accounts of them going down.
Personally, I would look for an X200b if you want the same type of throw. You should be able to find one for just a few dollars more than the TLR1 if you pick over the EE. If you want a tighter beam, an X200a or X300 is a good choice, but the X200a has a lower output and the X300 is a bit more than you would like to spend more than likely, even if you are looking on the EE. I went with an X200a model because I figured it would have enough light to illuminate anything I could hit with my G17, and I wouldn't have as much of an issue with the bounce back hitting my eyes, plus it is still plenty bright enough to blind someone from across a room or hallway.