Yeah they rule. Their music is so over the top it's good. I thought I'd hate that shit cause I'm not usually into power metal but DragonForce is just so uber. When I gave them a chance, I had to get all their records. Last spring was basically DF only on my ipod. It's so pompous it gets me hyped.
As for other "good" power metal, some old Stratovarius-songs are awesome. Check the song Speed Of Light. so good...