The central obstruction is the killer, close on to 30% if I remember correctly. So what you are really getting is a 4" scope.
But then, if you compare the price to that of a good 4" apo of the same focal length, and the added extras you need to buy for it, you are still a few hundred dollars in front.
So yes, it is a viable alternative to the refractor.
LOL I think I've talked myself into buying one.
Thanks Duncan.
I've always thought these were cute too. Ideal for solar system work. And only $500.
http://www.myastroshop.com.au/produc...sp?id=MAS-066A