Yes, nice.  I flew a Quantum 912 with an instructor for about 75 minutes back in April 03.  Loved it. 
I also got to fly an Airborne with the 912 motor in July 04.  I was real impressed, too.  Plus, the Airborne guys at Oshkosh really explained their product, and knew it well.  They seem to have a high quality product, and good support.  
Those are my two favorites.  I flew an Aerotrike many years ago on my first trike flight.  I hear good things about them too.  
All-in-all, I'd say I'm leaning heavily toward the Airborne.  Thoughts?