5 gallon buckets are retarded on an Ebb & Grow. Your plants wont ever use that much of a bucket. I grow mine 4 feet tall and they barely use half of the 3.5 gallon buckets......... All you'll do is promote water loss and waste nutrients really. Most people using 5 gallon buckets have purchased them from Lowes or Home Depot because they are cheap and in stock. They are most certainly NOT the best or proper bucket for E&F unless your going to veg them for a few MONTHS before flowering (which, some people for outdoors would, but not on indoor Hydroton E&G)
With respect to Grow Elf's system, it's cute and new and whatever, but this is the cap thread, not other companies. Everyone who posts on RIU about grow elf always has a very low post count and I think its more trolling for good publicity than anything. Most new people are asking questions, rather than sucking a manufacturers dick right off the bat.