I've used Mandriva since Mandrake 7.2 (that was a result of the miserable state of RedHat 7.1, ask your grandkids about that one)
The thing that really sells me on Mandriva is the huge software base behind it. The i586 and x86_64 distributions come on their own DVDs which ads up to about 1/4 of the whole software base. Then there's the Penguin Liberation Front (
http://easyurpmi.zarb.org) resources which adds fully configured ffmpeg, mplayer and other codecs to Mandriva's huge software base.
Then there's DrakConf which is a really, really, nice configuration center. I looked at Fedora, Ubuntu and a few others and realized how much I'd miss Mandriva if they went away. I'd cope but Mandriva is really in my comfort-zone.
As for paying for it, I've paid since they had their club and always bough the powerpacks. I don't need the powerpacks but Mandriva deserves the money.