Hi All i've decided to buy some good quality headphones for my macbook pro AKG451. This got me thinking of adding a portable amp and was wondering if it was worth it. I have a 2010 macbook pro and feel the sound coming out of such a expensive laptop as poor. On Amazon the FiiO E17 Portable Headphone Amplifier and USB DAC has some good reviews . Does anyone use this and if so is it worth buying .Or for that matter any other Amp. Thanks.