whatever you call them i know many folks have issues with them while many love them. for those not so into them this bloke has come up with an alternative. currently only in rubber so probably not so good for the long haul but if you watch the clip he's talking about polyeurethane and other materials to hopefully get a bit more durablity into them.

http://www.abc.net.au/tv/newinventors/txt/s1917574.htm