Hmmm.
Releasing RAM is normally a function of the operating system. For example, Windows 3.1 and 3.11 were notorious for not releasing memory used by a DOS application running in a window and even doing a CTRL-ALT-DEL would not clear it - you really needed to do a cold boot.
However in this age of WIN2000 and WIn98 I would have thought that they would have the memory management under control. WHile this product could certainly have some benefit I really think it depends on what OS you are using and how big you 'think' the existing memory problems are.
For $20 I guess it is not a big risk but be clear about any effects it could have on your system before installing it.
Hope this helps.
BKN