Pro is that the smaller disk is lighter, as is a plastic wallet for it, so postage will be less - this is a big factor in sales to the USA etc., doesn't make much difference in the UK.
Con is that the actual disks and sleeves are a litte more expensive than the usual size, and label stock seems to be unavailable, so what I'd be selling is unlabelled disks, with a paper insert in the sleeve, which will cost about as much to make as the usual size with labels.
So it won't be quite such a nice product visually, and it'll be on a weird little disk - see
http://www.blankdiscshop.co.uk/acatalog/8_cm_CDR_discs.html
for an image of the disks and sleeves.
There's no advantage in the UK, apart from slightly easier production since I won't be messing around with labels; the big advantage is a saving when I send disks overseas, which will cut costs a little when I send out the next release, then increasee the amount I can give to charity when it goes on sale as the next charity CD.
The question for the assembled multitudes - would you be happy if I sent you this instead of a full-sized disk with a paper label? Also, are there any known problems with 8cm disks?
No rush about this - I think we're talking August or later before I'll be ready to send disks - but all comments gratefully received.