I'm a big fan, as I'm a pretty tough clincher, and this helps the stem and my teeth. I also hate dealing with oxidation, the bane of my OCD. So I lean toward pipes with non-vulcanite stems.
I find that since I use the flush method for cleaning my pipes after smoking, this is part of the ritual. I simply slide the bit around with some water and dry it with the paper towel before using it to swab-out the bowl. I then do the normal pipe-clearer run through and voila.
I can get why some people don't like them, because they can be a bit of a pain, but overall, I find them handy. I would love to see others post links to alternatives though. I've seen some chatter about tape, other types of bits, etc.