Sorry, can't comment on that one, but I found all I need is this $16 Intermatic I got from Ace Hardware:
http://www.acehardware.com/product/i...entPage=family

Granted I have a very simple system; I only run a 3/4 hp Hayward set for 110. But after two summers I've found two periods a day totaling about 8 hours was enough. I just make sure a couple of those hours are in the afternoon when sun stress is the greatest.

C.