JUST installed the 350 pro, and here's input from a newb:
1) came without the screws to hold the biopro to the tank. Quick trip to lowes, and that was solved.
2) you really have to watch the directions and assemble it JUST like they say, with the hoses on the proper ends of the "T" for the bio wheels, etc.
3) directions said to use 1/2" tubing for the bio wheels, but there was no way it was going to fit onto the t they gave me, nor on the biopro. so used the 5/8 tube, seems ok.
4) I bought some hose clamps and put them on LIGHTLY instead of the rubber bands that they included. One tube on the T just WOULD NOT stop leaking, so I applied a little plumbers goop to the fitting and voila. Hose clamps MIGHT not be a good idea, but they worked for me, and I feel better about them.
5) make sure you install with the tubes going UP. Mine required elbows above the canister to fit into my stand, which therefore makes it a little hard to burp. If it doesn't burp right, it makes a bit of noise. But turning it on/off, and tilting a little seems to solve this.
6) I can't tell you how I like it, cause it's really my first filter, but so far it seems really nice to me....... The price on B i g a l s was too good to beat, esp for the pro.
Later!