hi Stretchwickster,
I've used Abbrevia as well and it didn't please me.
First there have been some strange "features" I could't explain, and then the compression speed was very very poor compared to TZipMaster. Even with setting "optimize speed" (or something like that) it turned out to be 3 to 4 times slower than ZipMaster when compressing many files in one folder.
I cannot recommend Abbrevia.
wbr
Roderich