I have heard nothing but good things about GLA.
For some reason I always see people spending WAY too much money on CO2 equpiement. You can setup an entire pressurized co2 system from the co2 tank to the diffuser for well under $100.
Find a used Aquatek regulator for $40
Get a used 5-10lb tank for $40
Co2 tubing, check valves, bubble counter and diffuser from china for like $11 for everything...
You're probably right about the cost differences. Can't say I've heard anything good about cheap Chinese diffusers though.
I just got my GLA pro last week and I ordered it for 2 reasons. 1 reason I didn't want it to break and it has to be able to run while I'm on vacation for 3 weeks. 2, I've always had phobias of machines an equipment. When I was a kid I was afraid of the toaster and the oven. Then when I was older I was afraid of everything in the wood working shop at school. I had a lot of anxiety turning on that regulator for the first time. But The GLA needle valve is so good I won't have to play with it until the tank is almost empty.
Not a problem for people who have more time than moneyYes but it takes allot of time to find used things.