I think they are interesting detrivores, and much of their bad reputation is just hype related to how they look. Like lots of other things, keeping these depends on what else you want to keep in the tank at the same time.
The largest one I had was probably 2 feet long and was a vegetarian. Another, was maybe 16" and did have a taste for Xenia (which really isn't a problem, and might be a solution for some people). I used to hand feed the smaller one. Sadly, something else in the tank ended up getting the better of the smaller one. I suspect that a fish got the worm, not the other way around.
I find the "eeww" reaction to be very odd. It just isn't in me to look at a critter from that point of view.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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