Elektron Musical Instruments

Aside from the fact that it frees you from a computer - what are the 
advantages of the MD-UW vs. a standard MD using MIDI machines to 
control Abelton Live?  Abelton is designed from the ground up for live 
performances so it seems the two would be extremely complementary.  
Play live guitar, a record, a cd, etc. into Live and trigger them via 
the MD?

I'm keeping an open mind and I know there are users strongly in both 
camps but it seems to me that $500 spent on Live (providing you already 
have a computer and audio/midi interface) would be better spent than 
the extra $400 on the UW option.

Is there anything obvious I'm overlooking?

Thanks!