TT EX1200 is a superb filter. Like others have said, built well, runs well, good output and very quiet. Mine is in a cupboard under the tank and you have to put your hand on it to feel it working, it's that quiet.
One thing I can find fault with though was the stupid plastic plug on the end of the spraybar, which kept coming off due to the flow. In the end I got sick of fishing it out the tank so left it and now it's gone missing under the gravel somwehere
I had the same problem at first,but i have since wrapped a small bit of ptfe tape around the bung,keeps it in place
I know some people silicone them in place, so it might be worth you doing that before you prime yours mate