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[ReadOnly]

before locking this topic, I can post the final global compression ratio results since the rebuilder finally finished

mame 0.145
18664 sets, 187899 roms, raw : 139GB, zip : 64.368GB
global compression ratio : 0,46307913669064748201438848920863

mame 0.148
28427 sets, 211052 roms, raw : 150GB, 7zip : 28,396GB
global compression ratio : 0,18930666666666666666666666666667

[Roman]

with chds, 148 is roughly 300GB and fits perfectly fine on current multi-terabyte hds which cost nearly nothing....

[ReadOnly]

It's true for a single individual wiping of 40 gigs (which does not include gain from lzma in chd v5) is certainly not very much significant. But looking at it more globally, the gain in both hard drive space and bandwidth cumulated across all the people who would use/share may not be that ridiculous.

But to be entirely honest, I would not recommend 7zip to anybody other than casual users who just need to have a set ready for some occasional testing/development or whatever AND who do not update frequently.

People who use MAME on a regular basis as gamers or who update their set frequently should stick to zip. The extra loading time for sets with a lot of clones and the extra computing resources needed to maintain regularly a set make 7zip not very appealing to those users which I'm not part of.