I have pitlocks and am happy with them; I keep one key in the rema box that has my tire patches, and another on my keychain. The extra 15 seconds it takes to remove the tire (if that, since you're going to be getting out your patch kit if you have a flat anyway) is much less than the time you would spend separately locking your front wheel every time you lock your bike. And I think that they are at least as secure as my main lock; it's probably simpler for someone to angle grind through my U-lock than to figure out how to remove the pitlock.