I had a negative/learning experience with Polk's RTi line.
I heard them on the floor at Electronics-Expo and loved how they cut through all the other noise there and presented a sharp, defined soundstage despite sub-optimal conditions. Detail!
I took a 15 minute (at most) non-critical listening session as a full-on sure-thing that THESE were the speakers I wanted, and soon! So I ordered RTi8s, RTi6, a CSi3, and RTi A1s for a beastly surround system (added Monitor 30s for 9.1 w00t!).
Within a few weeks I realized something was off. I started swapping speakers, trying different positions, different amplification, different cabling... definite improvements, but not quite what I wanted.
It finally dawned on me they just weren't the speakers for me when I heard a pair of Infinity Primus 150s at a friend's house and almost cried. All the same detail was there, but the presentation was much more laid-back and effortless. The RTi series are very forceful in the mids and treble. Where the Primus disappear, the Polk's cry "look at me, world! Love me!"
For some, particularly lovers of home theater, I think the RTis are a great match. But for out-of-the-way background music I think you'd be better served with something else. I'm still trying to unload the RTi6 and CSi3, fwiw, and if you get them and love them that's great. Like I said, though, it's been a real learning experience on speaker shopping.