I like how they start off with the Vivaldi sonata (for 1 cello), and move to the "featured song." (Might be a nice alternative to the 3 Popper duets). I'm very impressed at around 2:03 that there is repeating 16th figure, and one cellist is playing single chords and the other is hitting the back of his cello. (Ok, so this piece works better as a trio).
I guess it is a matter of taste. Personally I think they are very interesting. Certainly I'd go to one of their concerts, but I'm not sure I'd buy an album...
I believe this is the "group" if anyone wants more background info on them (they have an album, were on "Glee", open for Elton John): http://en.wikipedia.org/wiki/2_cellos