I guess I'll put my own strategy in. I'm 8/8 for RSVP. Some of the shoes I got included the Bred XIs, Miami Vice Lebron IXs, and the Stealth Foams, so that should give some idea of how effective it is.
What I did was make a new Twitter account specifically for this and follow only your local Niketown's Twitter account. Get the Twitter Notifier for Chrome. If you don't have Chrome, download it. Link your Twitter Notifier app to the newly account you just made. The reason why I said to make a new account is because if you're following hundreds of people, you'll get a popup every second of their Tweet, and that would be annoying and you might miss the RSVP.
Then I set up my window like this:
Make sure the curser on the DM window is in front of the # to save yourself an extra second to have to click on it. Every second counts. Then when Nike tweets the RSVP, there should be a popup window on the top right corner of Chrome, and all you gotta do is click on the window where your DM is, type it out, and hit send. And no, the tag isn't case sensitive, so don't try to waste more time and effort by trying to capitalize certain words. If everything is done correctly, you should be able to get the RSVP within ~2 seconds.
This probably isn't anything new for some of you guys, but a lotta people have been asking me for tips.