I am partial to Blue Line regulators. They look just like the Milwaukee. I have had a few customers who had problems with their Milwaukee regualtors, but the majority love them and have no problem at all.
as cass said, milwaukee regulators are good for the price you pay. but keep in mind you get what you pay for. are there better options, yes of course. but it will cost you more
lets not let cost get in the way of what is best, I am asking, if not Milwaukee, what are the better systems, I really would like to hear from hobbyist who are actually using pressureized co2 equipment.
best aquarium regulators out there are the Sumo line. next to these, id say that any regulator that uses a Cornelius body would be second. youll have your choice of needle valve with either of these. with needles valves, the best available is Ideal, Swagelok, followed by Fabco, then Clippard.