I have been using Wisycom MCR42s with Sennheiser SK5212 mk11s for about 2 years now. I have the DSP set to include Wisycom, Sennheiser and Audio Ltd. All the the receivers have now been fitted with soft flexible antenna. The stiff ones get broken to quickly. I regularly run over 12 channels using less than 16Mhz window. So far no problem. Battery life is poor so most of the time they are run via external NP1. Sound is fine although I must say that I do prefer the sound of my EK3241s which are warmer. The switching range of some 200Mhz is fab. I have just bought a load of the Low range units and have another 10-15 Mid range on order.
I would like to see a simpler user menu along side the main menu but otherwise very happy.