Hi there,
For over a year now, my gig setup consists of nothing but my Kronos 88 and a Roland AX synth.
Most keytars look toy-ish, so for me the AX-synth was the only choice. And I love it!
Although the sounds aren't bad, I decided to use my Kronos as the only sound engine in my gig, so I'm using a wireless MIDI system:
- The CME WIDI-XU looks like a USB drive and works great on the Kronos. Plug 'n play!
- The CME WIDI-X8 is attached to the keytar. The MIDI connections on the AX are on a very inconvenient place, and it doesn't have a belt clip. I purchased a soft case for a photo camera (with a belt clip) and secured it on the shoulder strap. It needs getting used to, but it doesn't bother me anymore!
I've never had issues with latency or bad connection.
One of the issues I had was monitoring. As soon as I moved away from my Kronos and floor wedge, I couldn't hear much of my own sound. I now use a wireless in-ear system as well (AKG IVM-4).
So, in short: I love this rig and I highly recommend it. When picking up the keytar on stage and walk to the front of the stage, I feel like I'm no longer part of the stage decoration, but an actual member of the band!

(If you're a drummer, please don't feel offended, lol!)