I'm very pleased with the Tippitoes seat. It does the job, with free delivery it's a bargain, and the pink colour is, well.... VERY pink!!!
Having two loos, one with a wooden seat and one with a plastic seat, the 'trainer seat' sits solidly enough on both. It doesn't strap on or anything but the rubbery ridge on the underside seems to create enough friction to keep it in place.
I'm NOT an employee of "Tippitoes" or amazon, when I read customer comments I often wonder if the "gushing reviews" are written be members of staff.