They were ok, though a bit slow (particularly in startup time) and MythTV proved a little difficult to get working with the hardware I had. I first tried out MythTV and MediaPortal on a spare computer.
Well, that was well and good for music, but I wanted to do more (view pictures, videos, etc). Using the matched routers to do the wireless communication gives significant communications improvements over using the wireless B. Even though the MP101 includes wireless B support, in order to have optimum playback performance, I used two Belkin Wireless G routers bridged together and connected the MP101 to the bridged router via ethernet. Unfortunately, the free version of MusicServer is no longer available from TwonkyVision as it is now part of the TwonkyMedia package, but you can still get it from places like the 'Files' section of the NetgearMP101 Yahoo! Group. For some time now, I've been using a Netgear MP101 with the free TwonkyVision MusicServer.