I did not upgrade to the ES version. I have one already that is ES version and I personally see no reason for the upgrade after playing around with them.
I have 2 of those 55g blue barrells that I too got off cragslist. They have the 2 small holes on top. Mine came from a local food distributor and one had vinegar and one had soy sauce in it. After some soap/vinegar and rinsing I'm using them with 0 side affects.
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Josh
Current Tank Info: 180G in-wall, 3x 250w MH radiums on M80 ballasts, Cree LED actinics, Deltec TC2560, Bubble Magus Doser, 4x Vortech Mp40, Dart return, Neptune Apex
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