I purchased an MX8 5/31/2013. Never cliimbed walls at all but it worked somewhat well the first week. Hasn't worked well ever since. Creeps along at a VERY slow pace. I have since replaced my 12 year-old pump with a new pentair intelliflow vs, and replaced the cartridges in my filter. I'm very disappointed with the MX8's performance. The pool professional who installed the pump helped me verify the correct amount of suction. I took the MX8 to Leslies for warranty service. They replaced the paddles, motor, and housing and it's still not working any better. I decided to call Zodiac tech support to get some advice. First guy, suggested I move the hose from the dedicated suction line to the skimmer (???). He swears it has fixed issues for people in the past. Now...I'm no pool expert, but doesn't suction=suction=suction as long as it's constant and without air? I couldn't believe the guy persisted with his advice even though I assured him I had accurately verified suction with the Zodiac flow meter on the dedicated line. After hanging up with him I called back immediately and got someone else who discredited the advice and advised me that Leslie's shouldn't have sold me the MX8 for a pebbletec pool. He said a pressure cleaner is the way to go. Hmmm. Well, alas I'm going to take the cleaner back to Leslie's and have them keep replacing stuff under warranty until the thing works. I'm hoping they give up and just allow me to exchange it for something else. When I bought the MX8 I replaced an aging Barracuda...which actually did a pretty good job. I only replaced it because the parts I needed cost a third of the price of a new one...which is when Leslies talked me into the MX8. Sorry I can't be as complimentary of the MX8 as others on this forum. Perhaps I got a lemon, but my experience with the MX8 has been awful. If anyone has advice on how to approach Leslie's/Zodiac for an exchange please let me know. Thank you very much and I want everyone who contributes to know how much I really appreciate the wealth of knowledge these forums provide.