I've been using a CO2 regulator from aquariumplants.com for 5 years now, and I haven't any issues whatsoever. It's all electronic, so there are no needles or valves or anything to wear out. I can set the bubble rate from 4/second all the way to a single bubble every 10 seconds just by rotating a dial. Yeah, it's one more thing to plug in under the aquarium, but I wouldn't even consider going non-electronic (at least for a regulator) ever again. I paid something like $250 I think, and haven't had to spend a single cent since 2009, and haven't even had to waste a single brain cell on problems either. It's never dumped CO2 at the end of the bottle either.
It's expensive but worth it, in my opinion.
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