I can pretty much guarantee that if you had the ability to adjust your shocks, you would. I have the R9000XLs on my truck and adjustable shocks are just about the best thing about my lift. I stiffen the ride when towing the boat and can soften the ride on long road trips. I do not use the on board compressor however. Although it would be nice, it's not a big deal to turn the dials manually.
The QuickLift supposedly gives less than 2" of lift, but so do the Bilstein 5100's (had those too). If you have some leveling requirements, you can always use the standard length R9000xl and put your spacer on top of that.
I personally love this shock and highly recommend them.