I am one of those people who stopped and than tryed again. And I know why I did it - because I was expecting too much too fast.
PR delivers what it claims but it does take some time. You gotta be pro in PRing to have results like those. Pro means letting PR be part of you. Pro means that when you pick up a book you feel the urge to PR it, not read in regular manner. It means PR is "your" technique.
That doesn't mean you won't benefit from it. Far from it. You certainly will; it will only take more time to activate material. The main thing is that you remain open and positive. Notice small things, fellings etc. Play with it. Results are inevitable.
How much results is different story, however. I can tell you one thing. After PRing you won't know a thing. How much you'll know depends on your approach. If you're relaxed you'll activate more. If you're stressed and pressuring it you'll probably activate nothing or very litte (and quit after a week or two).
If you (at the beginning) use PRing on material you like/have interest in and if you approach to it relaxed, than you'll achieve much more than you asked for.
One more thing. You probably cannot PR at 1000 wpm, you must do it faster (usually about 20000-25000 wpm). What matters is the "activation" speed. That is where real "character test" is. That's where people quit or stick with it and reap rewards.
