I would stick with a name brand if I were you. It is not worth a couple bucks to skimp on your water. Also, most people have no need for a 100 gpd unit. I have a 50gpd coralife ro/di and I supply water to four of my friends and mine which is a 180, 120 90, 55 and two 29's total. I have no problem keeping up with water at all. And I change 30 gallaons a week on my 180 and evap 5gpd on it.
Plus the coralife filters and such are readily available and very inexpensive.
Just my opinion, as I have read alot of bad stories about the egay units.