Have him put in a GFI 120v outlet. Then you can get any robot you want.
I ran a 1.25" conduit to the edge of my pool, under the concrete, and then run the cable through it, and leave my robot in my pool all the time [I have a lot of leaves and it runs at least once per day]. If you think this might be an option for you, it would be very easy to add this now, and very hard later.
Finally, My brother borrowed all of his neighbors robots [7 different kinds], and was definitely sold on the Dolphin, he said it was obviously better for him. So I got the Dolphin, based on his informal trial run of each companies products. I am happy with my Dolphin, however.
What I don't like is I can't set the time when it runs. It will run every day the same time as the first time I set it to run. I also don't like that there is no iPhone app to control it. I believe the new S300i has this, but mine doesn't. Bummer, but not really a big issue because once I get it going approx the time of day I want it, then it doesn't really matter.
What I like about my Dolphin is it's performance. I get a lot of leaves, and it holds a lot, so I can usually just empty it once per week, and that is after running 2 hours per day and 7 days a week.
Also, it scrubs the heck out of the water line. I have not had to scrub the water line in quite a while, because it does such a good job [except see next].
It can't get the waterline above the shallow step because it can't get to the top step, it won't climb that last one. Maybe no robot can do this, but the Dolphin can't. So I have to scrub 5' of waterline each week. The rest is totally taken care of by the dolphin.
It is thorough. It seems to be able to know where it has not yet gotten, and it covers it. there are zero leaves in the pool after it runs, unless it is windy and they keep coming down during the clean cycle.
It is robust. It has been running every day for a year and a half, and the only signs of wear are scratches and scrapes (cosmetic). I expect it
It is user repairable. It is modular, so you can buy the parts and fix it yourself if you like, and are slightly handy with a screwdriver.