I have Throttlemeisters on mine. I have never liked them, and have put the old fashioned throttle locks on my other bikes (such as the "Vista Cruise"). But that just didn't seem like a very elegant solution for the Ducati so I went with the Throttlemeister.
It is a bit of a pain to use, but it does the job. I rode my normal Sunday morning ride this morning - 140 miles total with a fair amount of straight, flat two lane back roads. I probably used the Throttlemeister seven or eight times today I would guess. It works, but a true cruise control sure would be nice. I have cruise control on my BMW (and on two previous bikes). Once you've had it you will wonder how you lived without it.