I use both the Vizkey 90 deg bug, and a Vibroplex blue racer the Vizkey has a softer feel to it because its made of brass, the blue racer seems to have a harsher feel to it. I find the blue racer settings tend to loosen up over time the lock nuts just won't stay tight for long periods of time, the Vizkey never loosens up the brass holds tight with little effort. The Vizkey will adjust to a slower speed with out bolt on adapters unlike the blue racer. I find myself going back and forth between each key they're two different creatures with their own feel. If I were to do it again I think the Vizkey vertical might be the better choice it will slow down even farther then the 90 deg version. Oh and one more thing the Vizkey is almost silent sounding during use the Vibroplex clicks, clangs, bangs, dings nothing smooth about it. Listen here while the master DA bangs away on her bug.