You Cannot slam this lid! (which is a good thing) This toilet has a quick flush action(awesome) and no matter how much you go.....it handles everything. No plunging in over 6 mos. and counting. This toilet also flushes quietly and is comfortable to sit on.  They say you should put a round lid in a tiny bath(like mine) but the elongated is very comfortable& it's footprint isn't that large for my bath. I love it and the light gray color I chose. Very pleased with this fixture.