I've been riding with Stans NoTubes on my road bike with latex tubes for several months, and have had no flats. I did have a puncture - the dreaded hiss - and looked down to see the white Stan's latex squirting out, and thought it had failed. But a few seconds later it worked its magic, sealed up, and I had enough air pressure remaining that I didn't need to stop, and wasn't dropped by my fast group ride.
Very convenient to squirt into the tire valve. I'll keep a single use container for future measurement and buy a large bottle to refill it. Nice to know that after a puncture, I can re-inflate my tubular and still get home, at speed.