Thanks everyone. Hoping to get info from someone with an operational unit, but it's a good start.
Since you ask, and I'm in the calm of the office, (we're GMT+8 here),I can let you know of a move in Australia which will really shake the foundations of GA as we know it.
Out here, we have an organisation called SAAA, (=EAA), which has been the structure via which all experimental building was done. But there was a seperate organisation known as the Australian Ultralight Foundation,(AUF), now called Recreational Aviation Australia,(RAA) which handled all the very small stuff - up to 544kg.
Now we have LSA, and that falls under RAA. Our limit is 600kg,(same as yours), but we have no limits on speed -so if you can squeeze under 600kg and click 150kts -good luck son!
But RAA have just applied for 750kg auw for all LSA,and it's likely to happen,because that's what the European LSA aircraft are certified to under JAR
Now this means the VANS RV-9A, using the 0-235 engine, which has already been tested by VANS and the auw posted as 727kg,(1600lbs), fits under the proposed Aussie top weight. The performance figures are damned good - better than some of the expensive European LSA - and we are really excited at the thought of flying the very 1st VANS RV ever to get into LSA!
So, you can see why I need to locate every US owner who's ever borne the laughter of his mates, but stuck to the plan, and installed the little engine.
thanks again to all of you who've responded,