Does anyone have any experience with purifiers? I am trying to decide between Csonka Pro or Sharp Plasmacluster. Any info/ reviews are greatly appreciated.

There's a good amount of info and opinions on this here. Do a search.

I have the original Csonka and I like it for a small room. I would get a larger one if I needed it to cover say 400 sq. ft. or more.

I have the Csonka Pro model with the adjustable dial on the side. I love this thing. I couldn't believe how good it works. The only problem that I have been through 3 of them. First one, the ultra violet light burned out. It was still under warranty and they replaced it with a new one. The second one, the fan burned out and the warranty had expired two days after the final date but the guys over at Csonka were cool and sent me yet another one. So, I have another year on this one as it seems, but I love this damn thing. Because of this I finally can smoke in the house.