Chandler Recoilmaster and Aro Tek Ghost sights

[Phill]

I'm thinking of installing the Chandler Recoilmaster Ultra and the Aro Tek Ghost Ring site on my Glock 35 (for use in IPSC). Anybody used either of these products? Good/bad? Would the ghost sight take the gun out of the limited catagory? (The Ghost rings I've seen on shotguns where pretty big.)

Thanks,
Phill

P.S. you can see a discription of the Recoilmaster at http://www.lonewolfdist.com/chandler.html