I don't own a Topre, but I imagine CoolerMaster's memchanical (the non-clicky one) switches feel close to Topre. The travel is almost frictionless, but in comparison to Topre they're maybe a little heavier and very likely more softer on bottom-out (kind of mushy, but I wouldn't describe the keyfeel as a whole mushy).
The sliders are also MX compatible (although probably YMMV, my Gigabyte K81 keycaps fit just fine, but GMMK stock caps so loose they fall out from the slider)
That said, they're kinda loud (louder than a standard membrane, but quieter than a MX Red board) and the only ways to silence the keyboard are thicker caps and sound dampening foam in the case.