I bought the long stemmed one from Williams Brewing. I like it because it is rigid and can move it around in the wort. I generally use 90 seconds, not sure what level of oxy I'm entraining. I use the red tank from H D. I get several batches from one tank. Now that I know you don't have to open all the way, duh. I would like to have a refillable 5# tank for it though.