It's a whole different machine, it's not a fourmix, and it was designed around a specific market... they are not trying to replace the fs90r or the 110. I used one at my house and was nice not having to feather the trigger around vulnerable items. you set the desired rpms and if you need a full speed burst you just squeeze the trigger hard and it runs wide up until you let off and squeeze again which puts you right back into your desired rpm range.