I have Odyssey Extreme Monos and am absolutely delighted with the sound. Really feel as though I stumbled onto a great product, and did purchase used at Audiogon, but seller lived in adjoining city, so able to audition (!). Only quirk is that one channel occasionally (not often, and not loud, but audible) lets out some static sounding stuff, but in general the noise floor is very low. I am REEEEEEALLY picky, and even I don't think it's worth the bother to send them back to Klaus. In fact, when I upgrade my system, it will be with an Odyssey Tempest Extreme preamp (if I can get it to fit into our tiny available cabinet space), Groneberg (sp?) cables, and possibly the Odyssey Lorelei speakers. Also plan a DAC, possibly the Benchmark.