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I use the free on-demand version of SAS.

I haven’t used spysweeper, but I did consider it or counterspy as a resident anti-spyware even though they were paid options (certainly for me). My research also showed the heavy resource use of spysweeper, counterspy wasn’t so high a resource hog, a friend uses it and he thinks it is good. I can’t recall which but one of those two has a huge signature file (100MB I believe), I just can’t see how that is manageable and may account for heavy resource use.

I did try SpywareTerminator as a resident anti-spyware some time ago and didn’t like the interface, but resource use seemed OK on my system.

In the end I have decided not to have resident anti-spyware and just go for regular on-demand scans with SAS, having uninstalled avg-as not too long ago. The reason I dropped the resident AS option is because of my back-up and recovery strategy, being able to recover from any possible infection that I might get (in about 20 minutes) as unlikely as that might be. That option is good for me but may not be good for other users.