I didn't see any info about the warranty period in the FAQ or on Ryan's site, nor did I see any info about which version of the D1 is shipping. I contacted Ryan today and he got back to me in less than an hour. This info may be useful for the FAQ:
Let me try to answer your questions:
1) Warranty period of this unit is 1 year. It is made by old school components, therefore, the unit should work just fine for a very long period of time. Even if there is a problem after 1 year, we will still be there to support this unit, just drop us an email.
2) All new units have the gain reduced. In addition, we will test each unit with 32ohm low impedance headphone before shipment, you don't need to worry about the gain problem now, it has been solved.
Please let me know if you have any further question.