I have tried BetterZip 4.1.3 (using mainly Stuffit then The Unarchiver for decompressing files).
One very bad surprise has unfortunately appeared: BetterZip has, without my knowledge let alone my consent, totally changed the Finder QuickLook. When QuickLooking an dmg file, a very big QuickLook window appears, which is confusing and unnecessary. It seems there is no option in BetterZip to deactivate this (if anyone knows otherwise, please let me know.).
While some people may enjoy this, forcing it on the user is a behaviour that is for me not acceptable.
P.S. Better also states that many dmg files cannot be viewed being encrypted, while they can be mounted without any password...