The Raci is great !
It puts the finder eyepiece fairly close to the scope eyepiece, so it saves the back and/or getting dirty knees kneeling to look through the standard finder.
Sighting along the finder to get an intial starting point is a lot more difficult, so its then you want a telrad or rigel.
http://gar.customer.netspace.net.au/scope2/100_0222.jpg
The other difference is that being a "correct image" finder, the view is the "right way up" and not inverted as in the standard finder. The inverted view matches the scope eyepiece view.
This may or may not bother you. I think its a small price to pay for a big gain in comfort
