You'd have to compare the rejection rates for the membranes it uses I think to weigh in and make a solid call there. I still prefer to use the Dow filmtec 75gpd because it's much more efficient than the 100gpd. My knowledge on the monster units is exactly zero however do you have a link? I did run a pair of the 75gpd membranes with one waste line feeding into the second membrane but then it burns the second membrane faster and you're feeding your resin slightly higher tds water.
Seriously so long as you're allowing yourself lots of time to make water why not stick with a basic unit?
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