I may have been unlucky, but Stans for me has been pretty useless. 2 thorn punctures, and a flint slashing the sidewall in the first 3 rides after I fitted it, meant 3 inner tubes fitted trailside, and quite a lot of laundry time to get the latex off my shorts. I've had two valves come off the strips (never had a regular inner tube do that) which has meant two more inner tubes...Fitting tyres can be an exercise in futility, as if one tyre goes up without stress, you're pretty much guaranteed that the next one won't seal. Using a compressor? OK, but it seems to me, that as soon as you accept that you need one to inflate a bicycle tyre, you're pretty much admitting that the system has some pretty major drawbacks.
Having said that, the one huge advantage of tubeless is the low pressure you can run tyres at, it really is a revelation, and nearly worth all the hassle, which is way I'll be investigated proper UST systems before the Summer.
Yes I think it's the future, rim strips are an Evolutionary dead end though