From what I understand from the commit Aaron Giles posted, there should be few changes in emulation between chd v4 and v5 as far as I can see. However, the CHDs should be easier to store as V5 introduces LZMA compression and a more efficient FLAC library as well as updates to the Huffman codec. Also chdman.exe has been rewritten
On the downside, CHD v1 and v2 files are now unsupported, and CHD v3 and v4 no longer have write support (support is for read only). Also, your CHD diff files are now broken. If you need to keep your diffs, please apply them to your CHD.
You can find more info (including all the technical bits) in the commit Aaron posted back from 0.145 here: http://git.redump.net/mame/commit/?id=b8d510bca95e786441b9212280402a0ede9cfc6d
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Re: 0.144 CHDs...any technical reasons to update them to 0.149?
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