Rockchip player advantages(I'm comparing rockchip with action chip players, nano clones..) :
Good battery (well, some are not so good, but a lot better than those action chip players battery.)
Plays DivX, a lot better than the crappy AMV format.
They don't have much firmware problems.
Bigger screen than action chipset players.
Better sound than action chipset players.
Faster than action chip players.
More functions than action chip players.
Faster, and filebrowsing works unlike those action players lol.