SRS works well enough for me. At least it's near the top in the ROI optimisation. But remember that it's just a scheduling mechanism to save you time, not to

SRS works well enough for me. At least it's near the top in the ROI optimisation. But remember that it's just a scheduling mechanism to save you time, not to help remember, necessarily. I like the Harry Lorayne book on memory for various tricks and techniques to actually remember. It's not groundbreaking but goes over a lot of the standard and proven memory hacks.