Naaa.. TBH its overrated. i know a lot of persons who are running stunning sps system with out water changes, for several years.. I know 2 who are running on their 4´th year. I my self, have had several system, where i never changed any water, unless there was something wrong.
My view is, the "You MUST change 10% water volume each week" myth was started by the salt industry, to sell more salt. But it also depens on what kind of system you are running, some change water to avoid ion balance isues and so on. But i dont see that being a problem if you run calcium reactor, instead of balling.
Here is another system running with out water changes:
http://www.reefcentral.com/forums/showthread.php?t=1975963