A client of mine has/had some money down on an SJ30 three years ago...company has some serious problems...but the concept/aircraft is sound.....limited market for sure...not too many single pilot captains are going to fly over the pond by themselves...or sit in the 40s all day long...or be comfy with the speeds...it's obviously not a King Air...
That said, being an SP captain in Encores and such...Premier 1 was a good start....but the SJ30 blows everything away...can't wait to hop in one in Miami, fly the tracks, land in Paris in reasonable fashion that evening....
Williams engines are really taking over...there is an SII retrofit that makes the plane do like 2500 NM as well...400 kts...not a speed demon, but the days of single pilot over water international flights are now becoming reality.