I've owned these for a year now so I think I can pass fair judgement. Great headphones. A legend among headphones. Neutral, clear and the reference I use to compare all others. Very comfortable, the most comfortable headphones I've ever used with the Beyer over ears. I sold my Audeze LCD2.2 and kept these, that's how much I like them.
 
Surprisingly easy to drive for 300ohm. They improve with adequate amplification, but I think people really overstate how important it is.
 
I did have the headband crack on me when stretching it (they have a bit of a tight grip initially), but Sennheiser were great and replaced them straight away for a new pair.

 
I own a bamboo LCD-2.2. I bought them second hand for approximately 800 Australian dollars. 
 
These are the best headphones I have ever heard. The sound signature is so appealing to me they might have my perfect sound signature. Big, powerful, natural and textured bass when the recording calls for it. Smooth mids. And a slightly rolled off high, which is exactly what I want. I'm young and I really don't appreciate 'bright' highs, they fatigue me and give me a headache. High level of clarity.
 
Cominig from the Hifiman HE-40 they are better. However, they are of course a clear step up in price too. The build seems good, hopefully they end up being durable. I get a sense of handcrafted with them, probably due to the leather and wood. However, I do not notice the poor in craftsmanship that sometimes accompanies hand built.
 
Comfort is only fair. They ARE heavy. A bit heavier than the Hifimans. The clamp is at the level I like. Sometimes I get a bit of pain on top of my head, maybe this could be improved with a revision of the headband. I'm willing to put up with fair comfort for amazing sound though.
EDIT: They were too uncomfortable and gave me too many headaches. Sold them.

Bought one of the original Asgard 2s from Addicted to Audio in Australia. It had quite an annoying transformer hum, but I thought I would get used to it. I didn't. It was very annoying, particularly when using my powered desktop speakers at a low volume. It wasn't too bad with headphones (even open headphones). But still I really didn't find it acceptable, even at this price range, it should have been noticed before Schiit began shipping them out.
 
The Asgard 2 looks nice. I didn't love the finish though, it kept getting smudged with oil marks. Would be nice if it had an aluminium  finish similar to a macbook pro. But that's a small issue.
 
Build quality was average. One annoying thing was the power plug at the back was loose from when I first took it out of the box. Very loose, to the point where it would sometimes randomly turn off while I was listening. Really poor. 
 
The sound was really nothing special. Couldn't differentiate it from my Audioengine D1 (which is actually a DAC before headphone amp)with my HD600s and HE-400s in blind testing. Quite disappointing. It's not that the sound was bad, it was quite neutral and it definitely gave the headphones the power they needed but so does the D1 for a much lower price. 
 
Most likely my expectations were too high, but it was rather disappointing. I also didn't like my interaction with Jason from Schiit (although most people here do). He responds promptly, but I found him short and rude. I definitely did not feel like a valued customer. 
 
Fortunately Addicted to Audio have been great and have taken this very average amp back for complete store credit so I can try something else. 

I use these with my Audioengine D1 DAC (which is an excellent value DAC btw) and they really sing. The speakers have beautiful mids and highs for the size and price and although the bass is a bit lacking, it is of high quality. You can pair them with a sub if you want down the road. 
 
The build quality is brilliant. They feel really solid and well made. Audioengine are a great company and whenever I have contacted them they have replied to me promptly. The speakers also look great, very classy.
 
When I'm sick of listening to headphones these are beautiful small speakers to use.

Great entry level DAC. Noticeable improvement over the onboard sound of my mac. Pairs great with my audioengine A2s. Powers my HD600 and HE400 headphones very well, seriously can not tell the difference between this and the Asgard 2 (which very much disappointed me for the price). 
Gorgeous looks and build quality. Great size. If I ever upgrade my DAC I will use this as a portable/bedside DAC + amp. Powered off USB is great.