S15 I've had for a few weeks now and I have to say I'm very impressed. They are a very good size and feel very solid when you hold them in your hands. They sound very full, with excellent clarity and excellent bass response. I use them for my surround back channels in combination with the S35 center channel, a pair for the S20 for the front left and right channels, and a pair of Bose 302 for my surround left and right channels. I was very impressed with the sound of these speakers. They sound very clean and balanced. They probably could have been my main left and right front speakers if I hadn't found a pair of S20s at such a good price. You are extremely capable. As with all Polk Signature Series speakers, be prepared for the size of these speakers. They are very deep due to the "power port" on the back. Either way, these are great speakers and I'm very impressed with the entire Signature range.
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