The Tracker 4x (aka ThePoolCleaner) seems to be doing a pretty good job. The navigator seemed to cover the pool a tad better say in a 2 hour period, but no real complaints. It also seems to handle acorns without a hitch, and does pretty good on leaves unless you get a whole bunch, then they clog up the intake port. But that is to be expected. The navigator seemed a little worse for that. Does not seem to climb the walls as well, but I need to make final adjustments so it is most likely my fault (don't want to mess around in the cold water mostly).
Need to design a new barrier between the handrail and the steps. The PVC pipe I have there to block the navigator from wrapping around the handrail, well this thing just climbs over it.