I've been using an arranger in my rig for over a year now. I use a Korg Triton and a Tyros (which replaced a psr9000 this year). I find the setup (registrations) and quick voice access on the Tyros so convenient during live performances, I hesitate to replace it with something like the Motif ES which is more road worthy.

The Tyros is used for it's Drawbars, acoustic voices like Flute, Sax, Brass, and the strings.

In my home the Tyros does double duty entertaining friends and family, composing, and rehearsing.

Al