Using gcz, haven't heard (or encountered) any problems. Although space is not that expansive, all my hdds are getting full quite fast :/
Looking at New super mario bros, for instance, you can save a lot! It's 366mb compared to 4.4gb!
That's what I think/mean... don't forget the voting ... interesting battle between full ISO and gcz ... whereby the main question of gcz VS. cISO seems to be clear ... really only one "cISOler"?

ciso support in dolphin is pretty young and Dolphin doesn't support creating ciso files, only gcz ones.. so no wonder why gcz is more popular

Having a TB of HD space has made me really lazy, so full ISOs for now. I'll start compressing them if I need to later.
Anyone know of a gcz tool for doing a batch job?
all cool, no that just a scrubber but darn handy at that. I need the same for gcz.
of maybe a command line version?