I put most options on my R when I bought it, but I'd say the QS is the only "must have". No, you won't use it all the time, but for the times you peg it and use it, you'll love it. I have the Penner tune as well, and pinning the throttle and smashing up through the gears is reality altering. For those who find their QS isn't "smooth", it really should be and might need recalibrating.
Before the "old skool" crowds tell me I'm soft, the reason I optioned it was early onset osteo arthritis meant constant clutching can actually be painful for me, but fortunately the Rocket clutch is light enough that it's not really a problem. It was an issue on my Honda CBR1100XX which was also hydraulic, but strangely not as bad on the cable clutch on my Ducati SuperSport S - maybe lever shape was a factor. *shrugs* Admittedly the Duc had a QS fitted as well, but very primitive compared to the Rocket. Really only good for upshifts on generous throttle openings and felt horrible on downshifts (even though it technically worked). The Rocket however is slick regardless of whether you are wringing its neck or just scooting out of your street. It is officially Gadget_ho approved!