I own a Marantz Sr-18 and believe it is top quality. I spent several months researching and comparison shopping before deciding on this unit. I think it is a very nice match with my RF-7's. It is very quiet and seemed less harsh (to my ears)than Denon, Yamaha, B&K AVR202. Didn't compare with HK.
I replaced 2 channel Crown amp and Preamp. The Crown might have played at higher levels but was definitely noisier than the Marantz.
I have experienced no problems but have been hearing more quality concerns re: Marantz lately.