RODI micron question

[ReefOcean]

I was looking at the Aqua Pure RODI units and decided to check some reviews. People seem to think they are OK but it seems unanimous that 5 micron sediment filters are like spaghetti strainers. I saw a few recomendations for BRS branded RODI which are only slightly more expensive (albeit you need to pay for shipping) but all of their packaged systems also come with 5 micron filters. So what is the deal? I would assume that BRS would include 0.5-1 micron filters in their packaged units if they were so necessary. Is 5 micron good enough?