what's the difference between R4i and R4i ultra?

(I'm not very sure if this is in the right section)I'm thinking about getting a DSi and a R4 with it. I'm not really sure if I should get the R4i or the R4i ultra. Are the differences THAT big to get the R4i ultra?

http://www.r4ultra.com/product.htm

Ones real ones fake?

uh..think it's worth to actually buy the Ultra than the original?

Seems so. It's got a few addition features, check on the 'Compare' page of the site linked ^above.