I have had one experience with a Wilson speaker, so I am far from an expert, but I will give you my experience. I would demo the speaker, preferably in your setup, but if not, then at a dealer. I would not buy them without listening to them first.
This is my experience with the Wilson Watt Puppy. The dealer was extremely nice and did a tour of the system the Watt Puppies were connected to, showed me how to adjust the Watch Dog subwoofer, pointed at a huge collection of CD's and said, "You can stay as long as you want, if you have questions, come and get me," and then left the demo room.
A friend and I spent the next two hours listening to the speakers and playing around with different adjustments on the Watch Dog. There was a seat between the two speakers and if you were in that chair, there was the most three dimensional, accurate, pleasant sound I've ever experienced from a music system. HOWEVER, if you moved left or right, changed seating height the sound stage became flat and no different than fifty other speakers I've heard.
The Watt Puppy speakers were extremely accurate, but also, extremely directional with a very, very small soundstage. Whether that's the case with the Wilson speakers you're considering is unknown, but you should listen to them very carefully before buying them.
