I have GHWT which I love but I think this may even be better....
too soon to tell for sure but the tracks I've played so far are very well put together, feel very musical and are just fun to play.
The drumkit from GHWT works very well - in fact it seems to work better here than on WT as there is very little lag when playing impromptu bits! strange that. Orange cymbal is not used but with the way the drumming is shared out more evenly across the remaining pads i do not miss it.
Overall a nicely polished game that I know i'm going to enjoy for a long while and would recommend to everyone.
ps. DLC is much cheaper than for WT!