I owned an ST2 from 2003 - 2007. It was reputed to be the last one imported into the country before the ST3 arrived and was a good bike, with many miles in France and Spain covered during those four years.
Problems were limited to the paint flaking from the underside of the engine and a leak from the clutch slave cylinder (much later on, not the cause of the flaking paint). On tours, others always said that I should call the breakdown service before we started riding for the day, yet it was without exception the one that finished the trip without problems. The downside of ownership was that, as the dealer once remarked to me, they do sound like a cement mixer when idling!
In the end, I sold it solely because the local dealer closed (the second in a short time) leaving me with a 140 mile round trip for any work that I was unable or unwilling to carry out myself.
I really do think it's a great pity that Ducati did not persist with the sport touring range. Whilst I agree that the Multistrada could do everything that the ST could, it has a totally different feel to it and, with its very high pillion footrests, would not ever suit our needs.