I've rented from Rockwel for 3 years. I've been very happy overall : no issues with the apartment; my maintenance requests get taken care of promptly; rent increases have been very reasonable; my experience with their staff has been entirely positive; and they have online bill pay, which makes my life much easier. I'd happily rent from them again, but I am moving away.
Update: After move-out I got my entire security deposit back in a timely fashion (within a month). I cleaned my apartment well (but not insanely well). These guys are great.