So Im replacing my Dimavery 10-watt amp with a new amp. Thinking about a Roland Cube 15? Are they gd? I play metal mostly.
I really like mine, I run my ux2 into it most times tho, but i find i get a better tone using the cube than UX2 as well.

IMO it could use a bit more gain tho
They're a good practice amp, I'd look into the Cube 30 though. Few more features/models and you get that bit extra volume, which is helpful with SS amps, you can play louder before it starts to sound all harsh and disgusting.