R Type III still eludes me.

I did pick up Metal Storm, though, and have been playing it here and there. I beat it today. Then I tried expert. The difficulty is not doubled, or even tripled - all slack has been pulled out of the game and every area requires an intense strategy. Usually you have to dart through the line of fire to the next safe spot. Actually I've only gotten to the level 1 boss, and that's after almost an hour of playing.