I tried ABC and found
A) upload speed limiting is a sad joke
B) there can be 10 seeds with no clients -- but you will not be downloading jack sh!t
C) no placeholders for files on HD so everything gets fragmented to hell
D) in general, download speeds were terrible
E) my wireless connection started randomly dropping out
switched to Azureus, and although it is an incredible resource hog (that's Java for you, the worst language on the planet for actual programs), it works properly, has a better interface than ABC, and downloads about 10 times as fast as ABC. yay!