Two things, if you like the sound of the rootmaster you won't like the sound of the DG. Those two amps are not at all alike. Second, DG has had a target on it's back for awhile, then with the sale to Korg it became even worse. They probably rushed the 500V2. Probably shouldn't have done that. That doesn't at all mean that they are all bad. There are tons of brand new amps with issues galore. A friend had a PV minimega that shut down on him so many times while on tour, they carried a backup, which at times also shut down. I hear horror stories all of the time, even about your beloved Ashdown. Rebecca Burchette amazing bassist of the band Multicult uses Ashdown and if you go to .44 of this video you see she has two Ashdown amps stacked, with only one on. That's because she brings two to every gig because they shut down all of the time.
People say that old amps never do this. I was using a PV Mark 4 to do some live recordings halfway through the recording it crapped out on me. Luckily there was another one in the room and we used that to finish up the session. Amps break, I'm not sure that the vast majority of DG users out there have had this issue.