Lumines doesn't look like a game I'd usually spend money on but if a lot of people are buying it simply to use to downgrade perhaps eBay might be flooded with them and I can get it cheap off there.

It's probably worth buying if it allows me to sample games before deciding which to purchase. How does it work once you have the custom firmware? Do you put the ISO image on a Memorystick along with some application to run it? Am I right in thinking a 1GB card will provide enough capacity?