I have the 535 mk I. Not sure what the differences are between it and the newer version. The 535 is a forward, aggressive sounding amp. Its best mated with warm, laid back, rolled of sounding speakers. I found it to work well with a pair of Wharfedale Diamond 7.2 speakers I had. Some people have reported using it to drive Vandersteen speakers. Its rated at 60W/channel and is know for driving difficult loads. Its a good amp to use in biamp configuration to drive highs/mids. Hope this helps.
