I got the PCB from Kevin last month. It's a fun easy build, took me under two hours to build this little amp.
There is an error in the parts list you will need about ten of the 22uf caps, not seven as listed. Check the PCB for the correct count, it has each one listed.
I use the amp with Sennheiser HD600 headphones through a SS tuner. I also use a good quality power supply for better sound. This is a cool little amp and well worth the cost IMO. Thanks Pete!