I have a Goldline Aqualogic (SWG and pool automation in one unit) and and very pleased with it. Where I work we sell Pool Pilot, Zodiac, and Resiliance SWGs (but can get other units if customers want them) They all work well. IMHO, the PoolPilot Digital is the best unit on the market because of the bells and whistles it has. The newer model Goldline units have included many of the same bells and whistles. Both compaines have excellent customer support. I am not as impressed with the Zodiac units for the price and the Resiliance is an entry level unit that is not very expensive. It does work well but lacks some features of the more expensive ones. Bottom line is this. If you get a unit from a company that has been making SWGs for a while and the company has a good customer support track record you should be fine! Goldline, AutoPilot systems, and WaterMaid have been manufacturing SWGs for a while now and are, IMHO, the big 3 names.
Just my 2 cents.