Besides the RF that Rob already mentioned, the Bessa-T for me has a couple of other attractions as well: a metal shutter that's accurate, and that you won't burn holes in, easy loading, and a very very very good exposure meter. You can read more about why the exposure meter is so nifty here:
http://www.cameraquest.com/voigtbmeter.htm
There's only one downside to the metal shutter, and that is that it's louder than a cloth shutter.