I always use the Roland DisCover5 - it replaces a Yammy 2k and a Roland SC88 (hooked to a laptop). The laptop isn't needed anymore. I'll also take along my VR760 most of the time. Now I've bought a Roland E09 to kind of handle style stuff, I haven't used it out yet. If I did I'd probably leave the 760 at home. Two keyboards are more than enough any job.

I sometimes used the 2k alone, but that was for small jobs where I didn't feel I needed the VK's drawbars. But then again,I had the SC88 running the midi files off the laptop.