I think it comes down to what suits you creativity (like Merlot above)
I've used Live for many years and that alone can yield amazing results, but since I bought the MachineDrum I'm making more music and seem to be using my ears and hands instead of eyes and mouse. I love it!
If you're searching for tactile feel (like I keeped searching for the absolute midi-controller) when get your hands on the MD and try it out. I haven't used the Jomox, Spectralis or Future Retro products, but they all seem very appealing and if you're an analog purist they may be better than the MD.
I'm working on a live-setup without computer consisting of the virus ti, machinedrum and a keyboard (remote sl - which can midi-merge) and so far it has been a blast.
Just my thoughts..
and good luck