I have the DR-500mce, not quite a year now, but I love it. Really sweet, mellow sound, plenty of volume.
I actually checked it out BEFORE selling my Taylor to make sure I was going to have an awesome replacement. I do.
Great guitar, I love mine. I just have a cheap strap, with thin leather ends, works well (can't tell the maker on it, hard to read script). Bought it just because it's orange, and has "Department of Corrections" on it. :naughty:
You know, the two guitars typically have much different EQ - sometimes it's not the volume that causes the feedback, try tweaking your EQ (bass, mids, treble) a bit on the amp.