I've used Mamba's for about 6 years now with good results on my in-ground rectangular 13x30 fiberglass pool. It sometimes takes time and effort to get a suction cleaner of this style to work well. Here are some techniques that I’ve discovered that help Mamba do a good job.My Mamba’s hose attaches to her control valve placed into the vertical pool plumbing suction connector under the pool wall skimmer basket. I use a skimmer basket with a built-in 2-inch hole on the bottom to run her hose through to the Mamba control valve. This method enables me to still use a skimmer basket and to attach the Mamba suction control unit below the basket. The Mamba control valve also sucks water, so this technique then causes the skimmer basket to draw in and trap water surface debris. The hose goes through the pool skimmer door opening, not over the top of the pool.I use a Hayward W560 horizontal leaf filter, attached to Mamba’s tubing about 4 feet out from the skimmer, to reduce pump basket cleaning. The “horizontal” leaf filter is preferred because it doesn't often get it the way of Mamba's ever-moving tubing like a vertical canister would. The canister floats because the suction will draw in air through the hose connections, but not too much air, just enough to have a small amount of air trapped in the leaf canister. I used clear box tape wrapped (and trimmed) a couple of times around the hose end to get it to fit snugly into the leaf canister. There are some informative YouTube videos on using the Hayward leaf filter. Usually, a couple of times per year, I use swimming pool gasket/o-ring grease to lube the rubber o-ring on the Hayward to make it easier to pull the top off. I connected 5 aqua colored tubes (purchased separately) and mixed them in with Mamba’s white ones because the aqua tubes bend more easily which then allows Mamba to turn easier.When she sucks in large leaves or a stick, she might stop clicking, but it's usually easy to carefully reach into Mamba’s pancake bottom opening and remove these obstructions, even with the pump still on - be sure to keep her submerged to avoid sucking in too much air. Although rarely used, Mamba's upper chamber clean-out openings are handy too. I’ve noticed that some pancake-style bottom suckers do not have this upper chamber clean-out feature.My Mamba runs around 8 hours a day for the 6-month swimming season, here in south Texas. In winter, I cover the pool and it runs 2 hours a day under the cover. With this amount of run time, they have lasted almost 3 years. Apparently, the internal (clicker) mechanism wears out, and although she'll suck water, she won't move about the bottom and it's time for her retirement. From reviews I've seen, Mamba's economical price is a good investment in pool maintenance and is as good, if not better, than the other more expensive pancake-style bottom cleaners.