I just swapped my BTC 9109 for this one from globlink:
http://cgi.ebay.com/ws/eBayISAPI.dll...4776%26fvi%3D1
The BTC is nice but my cons would be the size (large and meaty) and the stick isn't the greatest. This Globlink one has an optical trackball which works much better and it is considerably smaller than the BTC. The driver swr that comes with the BTC is better than the Globlink as it lets you do more customizing. Also a nice feature with the BTC is it has two buttons for scroll up/down that I miss on the Globlink.
Both are great keyboards but I am leaving the Globlink in the living room (for the small size and the optical mouse/trackball). I should qualify that I control the HTPC with NetRemote and my PDA for about 95% of the time.
Oh and I originally had an IR keyboard like the MS one and feel that IR is a much better way to go. If the MS one was RF I probably would have given it a go.
Cheers!