Lee:
Like you I have never owned one. The people in Dallas have had quite a bit of experience with Saito's and offer a pricey venturi set up said to be the cat's meow. For a look go to Ultra Hobbies:
http://www.egpworld.com/ultrahobby/catalog/CLACCESSORIES.htmWindy and Bob Zambelli also have a great deal of knowledge on them.
Seems they are not the rage among the top 20 as they were a couple of years ago.
My observations are that for every guy merrily 4 stroking along, there are 3 more guys in the pits trying to work out the bugs with their 4 strokers.
They seem to be real bad about shucking props.
They are heavy, pricey compared to a similar 2 stroke, and with the pushrods and all hanging out ,a crash into a hard surface is almost certain engine damage. Conversely, a two stroke with spinner into the asphalt has at least a 50% chance of surviving(depending on a lot of things of course)
Opinions, like other things, are something that everyone has. If you think it would be fun, get some good advice and go for it.
Jim