Hmmmmm, let's see - what will you GAIN?
1) Better vocals
2) Drums with different sizzle(maybe not "better", but really, really good
3) New, fresh feeling that only something "else" can give you
4) 76 keys with superior feel
5) Top notch SMF sound selection and midi playback

What will you LOOSE?
1) Easy, easy, easy navigation
2) Fast SMF playback, with instant drum remix (SD1 comes close here)
3) Instant, easy resale to thousnds of buyers worldwide

** Head to Head - these two compete favorably. In Don's case ..... he gets restless after a year anyway, so it won't matter much how they compare. He'll play it - make oodles of money with it, then sell it down the road. That's my boy !