I've been using a Quip for a few months now and the difference is very noticeable. I went to the dentist recently for the first time in over a decade and they had nothing but good things to say about the condition of my teeth. I know for a fact that before my Quip things were not looking that great, but in a few short months, I was getting complimented for my decade plus of untreated teeth.
It's not bulky like your standard electric brush, it's not overly aggressive like most electric brushes, and you really feel it doing the work as you brush. I couldn't recommend it higher.
Bottom Line: Yes, I would recommend this to a friend