I was in the exact same situation a month or so back. I learned that article as inaccurate. I almost bought Doheny's Saturn b/c according that article it's the same as the S200 and such but was significantly lower in price. The Saturn is definitely different. Cord isn't as long and it scrubs up to but not the water line..at the very least. Doheny's Discovery, Dolphin S200, Dolphin Active 20, and Dolphin Triton are all the same and people on TFP just call Margaret @ Marina Pools
303) 985-0077 and buy whichever has the best deal at that particular time. Some users appear to be choosing to upgrade - buying S300s and Active 30s for example. From what I understand the upgrades have more features and/or equipment (stand, more program options, etc. Similar to how the same make and model of particular vehicles will have different "trim" options (ie: basic vs fully loaded).