Just in case anyone is interested, I use the Elmasonic P60H, and think it to be a highly cost-effective solution for cleaning two records at a time.
Furthermore, I defy anyone to get records as clean, without one. I tried cleaning 4 records at a time with 18 mm spacing. They cleaned up beautifully, no trace of soiling, etc. But then, after cleaning 2000 records this way, I did the unfortunate test: two at a time. The result: grunge in the bottom of the tank after cleaning 12 records which had been previously cleaned 4 at a time in the same US machine. That's the objective evidence - subjective evidence is that they sounded far better.
I also did a few records (2 at a time) for the local high end store, and they were more than impressed on subjective sound. So, the jury is, as they say, in. Two at a time: 75 watts per record, 1.5 inch spacing.