I use the Aquatek premium on a 10lbs tank. It's alright. It's a little hard to get the bubble count right, it seems like it's either all or nothing, you'll go from 2 bps and with a slight adjustment bubbles are exploding out of the counter. I finally got mine in place at over 5 bps and haven't had any issues with it since.
I have a friend with the same regulator though and hers malfunctioned and released CO2 into her rank overnight, fish survived but barely. She got her money back and went and bought a GLA regulator for $300 something, quite a bit more expensive but a six year warranty, made and tested when you order...it's a very nice regulator.
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