I have a simple thermometer one (and had one of the digital ones at one point but lost part of it) my issues with the simple ones and why I don't use it is in things like pan fried meats I have NEVER gotten the temp up to what it says is correct... yet the meat is clearly cooked when I cut into it, sometimes overdone. I mean is that the temp it should reach while still in the pan or when its out? when does the thermometer go in? maybe I was always doing it wrong...
Honestly now I can eyeball chicken pretty well and tell by the way it feels when I pick it up if its done or not. then I can let it rest before cutting it open... so much better.
Would still be nice for other meats though. Espeically steaks DH and I like them so different that its a pain to try and get them right for us both