I bought a 5-stage RODI setup from these guys in 2010. I have had zero issues in over 18-month of owning it. I was told by some that the filters were cheap and would wear out very quickly, but with my usage, they produced 0 TDS for over a year (verified with TDS meter). I bought a replacement pack of filters from BRS and recently changed them out, just because I felt it had been a long time coming, even though I still had 0 TDS. I can't honestly say anything bad about it. I think I paid around $100.
http://myworld.ebay.com/dhillonnoni/&_trksid=p3984.m1439.l2754