This is an excellent DAC/pre-amp. I am thoroughly enjoying it. I purchased this to replace my Creative Sound Blaster AE-9. I immediately upgraded the op-amps to a pair of Burson Audio single V7 Pro Classics in the LP stage and a pair of dual V7 Pro Vivids in the I/V stage, and it sound amazing. I also have the A5 Super Charger on the way to complete it.