I have Polks. My mains are older RT7 bookshelves, but they sound very good for the price with a very warm sound and excellent soundstage/imaging. I also have a CSi30 center channel which again sounds very good. I personally can't comment on the sound of the R15 having never heard them, but in general Polk speakers are very good (and very under-rated IMO). The price is certainly right. Just audition them before buying if possible.