I am trying to decide what to buy to replace our Tiger Shark that I had forgotten died (after 8 years of faithful service and only a few repairs - by husband). Borrowed a Polaris P825 from inlaws and it was constantly stuck on the drains, wouldn't go in a straight line (cord not tangled) and never went into the shallow end - if I dragged it or started it there, it would make maybe 3 crooked lines in the shallow part and then return to the deep end. Not impressed. Next I borrowed our neighbor's M400 and it worked better, was in the shallow end more and did a better job of picking up the DE that the filter shot into the pool, but when I lifted it out, it dumped all kinds of stuff out the bottom just like the Tiger Shark did in the past. I need a cleaner with some sort of remote control or bluetooth capability because we have a big pool and the shark never got in one corner of the shallow end and one in the deep end. That leaves me with the Polaris P955 or P965 or some of the Dolphin cleaners (seems like Aquabots aren't well reviewed and I want top basket not bottom). There aren't many reviews on the Dolphin Active 30i (which I believe I should be able to demo this week). The M500 is sort of appealing (except for the dumping dregs out the bottom when removed from the pool like the M400) since it has a roller brush in the center of the bottom of the unit which might keep it off the drain covers). HELP PLEASE with suggestions - tried and true suggestions please. I appreciate that people love their new vacuums but I don't want one that will only work for 2 or 3 years when I am looking at spending $1400. Thank you very much!!!