i have the 150 and yes the overflow plumbing it comes with is very loud and gurgly but the return lines are perfectly fine, trying to make a durso overflow with standard home depot fittings wont fit either so what i did was kinda tricky but very possible....theres a pic in my tank thread...other than that, im really happy with the craftmanship of the glass
Had a 50g cube bust a seam after 1 year,would definitely go with another company,price is enticing but quality leaves a lot to be desired,currently have a 100g innovative marine ,build quality far superior,just my 2 cents.
I got 150 now over 3 years. Never had any trouble with the tank or filter. Make sure you got a solid stand and level the tank. Tank built with solid top glass brace for extra support.