My wife has one on her .45 Rossi. They are the best you can buy, no doubt about that. She loves it. What she really likes is the fact that they are totally parralax free, so that you don't have to worry about centering the red dot. Wherever that dot is in the scope you are on target.
The cheapest model I could find was on the net. $292.00, which included shipping, so they are expensive little buggers. If your interested I could probably dig up the site I bought it off of.