Traded my AKG K181 headphones for ljokerl's selfbuilt Mini3 Gain 5 High Performance. The amp was well packaged and arrived safely. Build quality is very good, the amp matches the RMAA results on the AMB site under both high and low imp loads. Unlike many builders ljokerl used a high capacity, high quality battery (300mah Accupower), which saves me having to change it.
Overall, a pleasant transaction. Highly recommended!