the biggest advantage for most is that when they do end of month sweepstakes, they dont have to worry about looking at so many sweeps with no check by them to see if it is one that they missed. Also it saves you from having to look at a lot of sweeps that you have already looked at and don't want to enter. when you come back to that days list to see if you missed anything, some people use this method and others don't it is what works best for you.

yes it does and adding to "my sweeps" would make it where you would want to enter that sweep again. so most people if they are going to go through the sweeps that will be ending at the end of the month, will check those that they have added to there sweeps and also those that they have not, which makes it easier  to search out sweeps they may have missed by looking for those that have not been checked.

Neither SweepsCheck nor MySweeps actually enters you in a sweepstakes.

SweepsCheck date stamps the listing.  It is handy for marking off sweeps you have already entered so you don't enter again and disqualify yourself.  It is also helpful for a 24 hour sweep so that you can see what time you entered and only enter again when your 24 hours are up.

MySweeps creates a list of sweeps for you.  I use it mostly for Daily sweeps that I want to visit each day, and Weekly sweeps that I go through once a week.  It lets me quickly find the sweeps I want to keep entering so that I can get in as many entries as they allow.

It makes going through any category so EASY, since you can see those you marked off already and ignore them!!! Especially helpful if you've fallen behind/are looking at the ending sweeps for the month, since a LOT of them end on the last day!!!