I've owned the ES-1, ESX and UW. They are completely different beasts though and it all depends on what you are after. In the end I just couldn't stand the sound of the Elektron anymore and I sold it (I also sold a MnM for the same reason). I probably used the Elektrons on 4 tracks in the year or so I owned them, but the ESX has been used on dozens. I find it much more inspirational and fun to use the Korg. For synthetic drums I patch those up on the G2 and sample them into the ESX. The workflows on the Elektrons are a pain in the rear if you ask me ... and yes I know my way around them like the back of my hand. I even built a custom joystick controller for the SFX60 before selling it. The param locks on the other hand are brilliant.
Your mileage may vary of course
