Anyone familiar with UPX Software?

[Bill Vlahos]

A friend suggested that using UPX software (http:// 
upx.sourceforge.net/) to pack/encrypt my software would help protect  
it from getting viruses because it would scramble the signature. It  
could also help protect the code in Rev Standalones.

Does anyone have any experience with this software? It doesn't seem  
like there are many drawbacks if it works as advertised.

Bill Vlahos