Funny thing about Headfonia, I disagree with almost everything they write, but they got it spot-on with their opinion of the Bakoon-Fostex pairing. Auditioned the Bakoon HPA-21 (the international version of the HDA-5210 they paired with the TH series headphones) with my TH900 and had one of those "mind = blown" moments.
My main beef with the HP-A8 is that it's amp section tries to flatline the TH900's sound. It's like Fostex made this ballsy sounding headphone, and then decided to neuter it with their amp. I like the DAC section though. Coupled with my Burson Soloist, I prefer the HP-A8's output to the Lavry DA11 and Benchmark HGC. May not be as hyper-detailed or "accurate", but it's airier, meatier and not as strident with the highs compared to the other two.
Agree 100% with Headfonia on this one
I own the Janpeese version Bakoon HDA-5210 - seriously mind blowing with TH900