I heard those 30R's that you will be auditioning, lol. I actually bought the Linn Kiko system he had as he wanted to get rid of it and I wanted something for the bedroom. It's worked ok.
I personally think the Vandersteens are much more detailed, dynamic, realistic etc... I don't love the Proac bass. I never did and I have owned three pair for over 20 years. I recently sold all of them. I still like the Proac's and there is a reason so many Vandersteen dealers carry ProAc also. Their ribbon is the sweetest Iv'e heard honestly. I like it better than so many of the esoteric 30k plus ribbons. That's just me, but the CT Vandersteen's magic mids win out. The presentation is about 20 rows back and not upfront. I personally like that as it allows the music to mature and I like air around the notes, just like it is at Carnegy Hall or the local Infinity venue we like to go to. It will be interesting to hear what your thoughts are.
Last year they had a pair of Zebrawood Quatro's that were gorgeous. I am still thinking I may go with that veneer when I order mine. Either that or I may have them upgrade to heavy metal flake dark Crimson. I think I'd love that look in my room and I'm not selling for a long time so I don't care if folks don't want to buy that look, lol. The Treo CT's are special speakers. If you loved the Proac's like I have/do, I think you are in for a treat, unless the guy showing them likes the Proac's better. I always always keep in mind that the dealers make more on selling Proac's so they often try to steer us that way ;)....Things to always keep in mind when purchasing, lol....you obviously know what you are doing randy. I've followed your posts, so it will be neat to hear about your auditioning....I forget the guy I worked with there, but I went to OU and have sent them a lot of business over the years. he was a younger guy I think. I'd tell you to say hi for me, lol.