I have never seen the RF-63's for demo, good thing, I saved a lot of money. I own both Heritage and RF/ RC series stuff, frankly, I like the RF/RC series. I run a pair of RF-52's with an RC-52 and it does a beautiful job in a relatively small room (12x8x10), be it Jazz, punk or HT apps. Man, when I saw the RF-63's I really wanted them, but up here in the Northeastern US we are not well covered by Klipsch, most people here prefer speakers that sound like they have cotton stuffed in them. If Best Buy doesn't have 'em the only way to go is mail order, which can be really expensive for big speakers. I would have loved to get the RF-63's and an RC-63. You need all three, sides and center to really get to that point where it is superb.
My mom has a set of Klipschorns and a Heresy center channel (circa 1962) it kicks, but I prefer the Reference series for most listening, I believe they are the future of klipsch. My Heresy II's have more personality, but when I am listening to intricate jazz, the Reference series rules, when I do HT, most of friends prefer the Reference setup, with the RF-52's and the RC-52, it is just more balanced. The point of it is to go with the sides and the matching center channel, the sound field created is great.
Anything Klipsch makes is efficient, I use a Yamaha RX-V361 and it has all the tools I need for some really awesome HT apps and for just plain old music. Go for the enitre RF/RC series, one listen will make you a believer. Geez, I like the sound of my RF/RC series stuff better than my Heritage stuff, which cost a lot more.
"You're gonna eat lightening and crap thunder..You're gonna be a very dangerous person."
Mickey Goldstein to Rocky Balboa
Enough Klipsch products, which only leads to the desire for more.