The top two seem to be:
1. AutoPilot - http://www.autopilot.com
2. AquaRite, by Goldline/Haward - http://www.goldlinecontrols.com
The Autopilot automatically adjusts the chlorine output based on water temps, while the AquaRite doesn't. Otherwise, they seem pretty similar. I just researched all of this recently and ended up going with the AquaRite, since I was already getting the AquaLogic control system. I probably would have gone with the AutoPilot, had I not been getting Goldline's controller, already.
From what I've read, you typically need to add more acid to keep your ph in check as the SWG's raise ph a little . . . Other than that, I've read nothing but good things about them. Most people say that it takes them as close to a maintenance free pool as possible. Actually AutoPilot has a new system, the Total Control System that incorporates an automatic acid resevoir into the mix, so you don't have to add acid manually. Haven't heard much about this as it's brand new . . . I heard about it from one of the companies I got quotes from. Priced at $1200 w/ a pool contract.
Sean, the autopilot and SWG expert on this forum, should probably chime in soon . . . Can't beat the PoolForum!!! Thanks again to Ben and all the other experts here.
-SJohnson
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