Ampkit is a guitar rig emulation app available for both iPhone and iPad. For this review, I was using the Ampkit+ iPad version and had access to all the extra add-ons and packages. It's worth noting there is a free version of the app as well. Hardware wise, you'll need to pick up the Ampkit LiNK in order to connect your guitar to your iPad or iPhone, available for $39.99. This is similar to the same process as Amplitube 2 and the iRig which I took a look at earlier this month.
Click through for a video demonstrating sound quality, some thoughts, and how I think it stacks up against the competition.