I don't have any DMR repeaters to use it on. HT to HT simplex on DMR is fine. Analog thru repeaters or to my Motorola XTL1500s on simplex works fine. Wish they were >1 W but even that 1W does a surprisingly good job thru a decent repeater. Audio is great.
I've been using the RT-10 on 902MHz ham repeaters for a couple of years now. Nice little radio, easy to program with the computer. Great deal for the price although it would be nice if it was higher power.