This upgrade is a little difficult to sell as if you don't need a new graphics card and have USB 2.0 there isn't a lot for you at the moment. As JB says its chargeable step from pre 5.12 to post 5.12, so you don't have to upgrade now, but if something that does interest you comes along in say 5.13, you can upgrade then. Castle have done a substantial amount of work improving the OS since the launch of the Iyonix and I suspect a little injection of cash is needed to be able to continue to make this commitment.
Thats fine with me, but then I'd also looking to replace my orginal 32MB graphics card with one that can properly benefit from Geminus' accelaration. I'm realiably informed that the FX5500 doesn't have a fan, so wont ruin the whisper quiet Iyonix experiance.