I have the Rainbow, and am in my 7th season with it. I've replaced the o-ring one time, and that's it, maintainence wise. My pool stays open year-round. Although I only use trichlor pucks during the swim season until my CYA gets where I want it, the rest of the time when it's empty I set the dial at "wide open" to flush it and keep the lines from clogging. So far, (knocking on wood), it's been no trouble at all.

Janet