Im new to Mac, and surprisingly it was VERY hard to find a replacement for PC's Winrar! A simple thing on PC like creating multivolumed archive appeared to be hard to do on Mac! After many days I finally solved that rediculous problem with BetterZip's help, so I just wanna say THANK YOU!
I've tried a few popular programs for mac, but they didn't do such an elementary thing!
As for Beterzip I had to "manually attach" rar compressor in Properties, but anyway it's working! i can finally create rar files with all the options.
Thanks for the good work!

...maybe i could only wish that Betterzip will be one day integrated in context menu just like winrar on PC, that would be extremelly convenient and i think leave competitors like stuffit and so on far behind )