The update checker is a small little trial that is automaticly installed along with bitcomet, it gives you a preview of how apphit works and shows, if the user would like to have the full program all he needs is to click on the update checker window, if not, just close the window and it will never bother you again.
Id say that it is a very good program but it still needs little tweaks, let me be more specific:
If my emule version is 8.01.2556.14 but it only displays 8, apphit will show a new update of the 8.01.2553.14, which is the same version but with more detailed release number, beside that, it is a very handy program.
A simple "dont show me more updates for this version" button should give a better user interface, keep up the good work.