I used to own the Polk Rt35i which (even though they were bookshelves) I believe used the same tweeter and 6.5" driver. I also had a Polk sub (10"). I wasn't impressed with either the tweeter or the sub. The midrange was pretty nice as I remember. I sold them about 3 years ago. I felt the highs were a touch rolled off and I'm not a fan of "warm" sound I suppose. I'm very happy with my PSBs connected to a Sony ES receiver, which some would say sounds bright (although not Klipsch bright
The sub I just couldn't ever get to sound right even after repeated attempts to locate it and use an AVIA disc and an SPL meter. Now, the fact that you would have 2 subs essentially might help with the integration issue quite a bit.
Again, the best advice is to go listen and see what you think. Lots of people love Polks. It does sound like a good deal if you like the sound.