I don't know what experience you've had with the Dr. Beats, but I can't imagine something easier to use

That said, I got mine about a year ago, so it's probably a newer one.
Mine is a DB-30 -- very small, very light, feels like the battery lasts forever. Considering the flexibility of the device and the physical aspects (loud, clear pitch on tone generator, dimensions are very portable and a clear display) I don't know what else it is you're looking for.