You have 12 inputs, but none are dual zone / stereo.
I just got the kit a month ago.
The only issue I had was the 16 note polyphony was cutting off my buzz rolls, etc.
You can't use chokable pads afaik either.
the hihat is open closed only - no inbetween.
The sounds are okay - but there are really only a few usable ones imho.
I ended up keeping the pads and selling the dm5 head and getting a yamaha dtx500 for a $100 more.
I would suggest this:
there are peeps on ebay selling the "real head" pads for about $40 each for the 8" - I would suggest getting a 10" for your snare - you can get a yamaha three zoner for $100 - so 3x40 plus 100 = about 220 for the toms/snare and figure $50 for a decent kick tower - total so far about $275 - you can get a whole BETTER rack from a high end roland or yamaha for about $75 = so now you are at $350 - add a used dtx 500 for about $200 or new for $300 and you are just a little bit higher , but WAY better - the dtx has triple zone snare and cymbal options with full choke and hi hat, metronome, 64 songs to play along with, recording - and way better samples of actual 5k yamaha drum kits.