Because of this site I bought the Benchmade 556s and I must say I love it. I got the serrated mainly for the seatbelt & rope options. (as has already been mentioned)

The main thing I use my knife for is cutting up fruit - 2 to 3 a day - the length that is non-serrated is plenty long enough for that. I keep the straight edge very sharp.

I guess the question I would ask is why not have the partial serrated?

is there some task/job that it isn't able to perform?

Sharpening is not a problem from what I can tell.