I'm a DB player and long time Phil Jones amp user, and getting ready to teach the second week of the Aebersold Summer Jazz workshops here in Louisville. I've been on the faculty of the camps for 21 years, and for the past couple of years the rental bass amps used on stage and in all of the combo rooms have been the new Rumble series amps. I think they do a great job, and they are also crazy light and reasonably priced.
I'm not about to run out and sell my PJB combos in favor of Fender stuff, but if I showed up to a show on the road and found one of these as the provided backline, I wouldn't complain a bit and would know that I'd already made many a joyful noise through these amps. I recommend them to students on a budget all the time.