If you see a product review on my blog, there is a good chance that it is a problematic product and that is certainly the case here.  My pool guy, Elmar du Plessis of Splendid Pools, said that this was the way to go in terms of pool cleaners and removed my previous system and put it in.  Since then I had to return it twice to the company that supplied it and it has just gone in for a third time.  I don’t know if the one I have is just a lemon, or if the product is just badly designed, but it continually needs new treads, some of the parts seem to break quite easily, particularly where the pipe attaches to the unit and whatever it is that needs repairing is always not covered under the warranty.  I think it does a good job of cleaning, but I don’t remember, when using a Creepy Crawly, that I ever had to return it to the shop three times within two years, so either I got unlucky and bought a lemon which the company does not want to replace, or it really is not designed robustly enough and does not deal properly with wear and tear.  I found it averaged 2.7 stars out of 5 on an Australian product review site that I found and while many of the problems that they write about have not yet been experienced by me, I certainly relate to this comment which was headed “Poor design” and says, “I’ve had two NX8 and in both cases one of the wheels snapped off from the main chassis.  The connection to the chassis is plastic and is part of the whole casing, therefore it cannot be fixed.  I will never buy another one or recommend such a poorly designed system.”