I've tried a lot of Skins, on both MediaPortal and XBMC. MayaHD is by far the best one: simple, fluid, rich and optimized with the final user experience always in mind.
When building my HTPC, I had long hesitations between WMCE, XBMC and MediaPortal. I finally choose MediaPortal because of MayaHD !
Great job guys ! Please don't give up ;-)