I've used a Barracuda and latest Kreepy Krawly last summer and gave up on both of them . They got stuck on their own shadows and did not get to all the areas they should have because of the return jets affecting their path.
So I upgraded to a Polaris ATV, which was an improvement but still missed areas because of water currents. Then one day it got really hung up and stripped some internal drive gears. Took it back for repairs under warranty. It still won't move.
After have read a lot of items on these auto cleaners I have come to two conclusions.
1) if the device used a 1 1/2" return or pressure line hose it will be affected by water currents and do a less than perfect job of covering the bottom
2) it seems that everyone who got a Dolphin Diagnostic or similar unit is very happy with them.
I think the writing is on the wall ( not quite on the check yet, but the pen is in hand.)
May 12 update - ordered the Dolphin Diagnostic ... fingers crossed
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