I've heard nothing but good things about Gleco Traps. When my classroom trap began leaking, for reasons I still don't know, I sent our Buildings and Grounds Head a link to the Gleco Trap. He instead ordered the same trap we had... It "works" but is a pain in the butt to clean, in a small awkward space. It consists of an outer layer, with an inside piece that slides in from the top. The inside piece has a strainer/ screen. The only way to know the trap is full, is to either pull the inner piece out, or just wait until the drains are slow. To clean, you have to undo the two hinge/ buckle locks that hold the inner piece to the outer, creating the seal. I then have to lift straight up, which is difficult due to low clearance of the underside of the sinks, as well as the water supply lines. The inner piece is usually hard to lift out, because I am fighting the weight of the water, the sludge, as well as the suction created. Then I have to move the trap into a waiting large bowl so I don't drip the sludge everywhere under the sink and floor. Also, there is usually some residual sludge that gets under the trap screen. So I have to scoop that out by hand.
So in summary, my trap sucks...
The dental office my Wife works in, uses the traps because of the plaster work they do. They've never had an issue with anything getting past the trap.
I will be purchasing one for my home studio, when I get the utility sink installed.