My unit feels a little sore after the 1000 but no pain, no discoloration. The erection quality is FANTASTIC. Talk about brick hard. I am thinking about sex and jacking and all while I am jelqing to keep my erection at at least 40%. I immediately edge after the 500 are done at each session. I have also introduced manual clamping and edging to my routine as well. The veinage really increases. Never do anything that is painful. When I first started in the first week of March I could tell when I started overdoing it a little and backed off. So, by no means, if you are really a newbie, start with 500 jelqs. Slowly move up to that. Also, don't be obsessive about measuring your cock. As it grows, you will be able to feel it in your hand. Let's face it, we are all pros at stroking our cocks and you will know when your size increases. I am a true believer in this. What sucks is I half heartedly tried this back in 2008 and stopped. Where would my dick be by now had I been committed?