I just got one of these this year (new pool), I was on the fence until I read CarlD's post in the "old" forums. I bought the CG model, supposedly 1/3 more suction and charges in 2 hours (instead of 8). So far, it has been wonderful. We don't currently have any type of robot (I have an Aquabot Pool Rover Plus on order, didn't really want a "scrubbing" unit, this one just uses water pressure to clean). The CG model includes the fine filter bag which traps silt and fine dirt really well.

The thing sounds like a toy until you put it into the water. Then you can just feel a little vibration through the pole. We have run ours about 30 to 40 minutes at a time with no problem. You do need to clean out the filter bag more often than WaterTech says, but we use a small bucket and it is no problem. We used it on opening, took several days to really clean up the silt that had fallen through our mesh winter cover, but now we use it once a day before swimming. We use the little roller wheels instead of the brushes, supposedly (according to the Watertech website) this provides more suction and is safe for vinyl.

My wife loves it, it is SOOOOO much easier to use than the regular vacuum setup. If it had a larger coverage and filter bag I might even consider not getting an automatic cleaner!