Any opinions on the cta digital bluetooth gaming controller for iPhone?

I want to know if it can be used on gba emulators, how it feels, preforms, basically anything about it I want to know. I definitely need a controller for iPhone 4S that let's me play my gba games. If this doesn't, does anyone know of a good controller that suits my needs?

Checkout the iPEGA PG-9017 Wireless Bluetooth 3.0 Controller. You can get it for $20 - $30 if you shop around online.

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