Yes, the valve is low-end. Yes, it will work. Yes, it's very finicky when adjusting.
You can upgrade to anything you'd like that has a 1/8" NPT fitting. Or anything at all, if you get a [whatever] to 1/8" NPT adapter.
If you want a Swagelock that works for our purposes, take your pick. M, S, 21/22, or O series will all work, some better than others. And there are plenty of other brands out there, too. Check http://www.plantedtank.net/forums/eq...n-our-co2.html and then cross-reference with Evilbay. Anything with a 1/4" tube fitting can be adapted to NPT.