Pros: Great sound quality, portable, excellent battery life
The Predator is a portable headphone amp with a DAC built in, great for use in the office when I listened to music from my laptop, and connecting to my iPad when I commute to/from work.
After the initial burn in of about 100 hours, the quality of the audio improved, with great music clarity. After using the Predator, it is difficult to listen to music directly from the iPad or the laptop un-amped...
I am mainly using the Predator with Sennheiser HD25-1-II, Grado SR225i and Monster Turbine Pro Coopers. It drives all three headphones well.
I also used the iPad/Predator setup to test Sennheiser HD650 and Beyerdynamic DT880 and DT990 (250 ohm). It drove those CANS really well too.