I'm glad that you found about Astell and Kern and have had a chance to demo one of their products.
I personally love the simplicity of them. I like that when I use it, there are no pictures to look at or internet to surf of text messages or anything like that.
Music has always been a big part of my life, and I am constantly listening to it. My musical tastes are wide yet refined at this point. However, in regards to equipment, I hadn't tried very many options. I had used the Beats Studios and the 2.0 version for a long time and I loved both. They were stylish, comfortable, and still fun to listen to to my ears. I have had reasonable 2.1 systems for my computer and have a reasonal 5.1 home theater setup. All good quality and in lower end price brackets. However, I was really curious about the world of Hifi (been a lurker at head-fi for a little while). Boy did that turn out to be an expensive decision....
Earlier this year, I had some disposable income and I took two really huge plunges. First was buying a pair of Shure SE846 IEMs. Holy crap...........I'll never listen to music the same way ever again. These things are severely unreal. I can't explain away the cost to most people, but despite being expensive, I believe they were worth every penny to me (I also got them 20% off new from authorized dealer).
That led me to trying to find a really good quality source for my tunes. I comtemplated a portable dac/amp to pair with my iphone, but I realized I also wanted the native ability to play lossless files (I know, I know they have apps for it). A dedicated player really intrigued me. That's when I discovered A&K and their line.
I looked at all of their models including the older generation devices and I picked out the newer generation AK100ii because I'm cheap

(as opposed to the bajillion dollar 240). I looks and behaves like a portable dac, can interface as a USB dac for desktop (PC and MAC), the volume knob is very cool much like what is present on most amps, and it is a dedicated player capable of high storage and lossless playback. It is also a beautifully designed object and even nicer to hold in person (was worried about the bulk of it based on pics, but it is very nice in the hand.) They are very expensive and there are certainly much less expensive DAP (digital audio player) options on the market that offer some similar features, but this thing is the package deal and the design of it is superb, which is a remarkably important feature for me.
After just one listen I was blown away. No noise and hissing, incredible clarity, detail and resolving power, and an overall perfect match for my SE846's. The battery life is excellent and charges pretty damn fast for what it is. These can be had for a good deal off the MSRP on amazon quite frequently.
I go to the gym a lot and I have to admit that I love tossing my phone in my bag, throwing in my headphones, turning this thing on and up (this thing can drive some pretty hard to drive cans at high volumes), and knowing that I can just focus without tons of phone related distractions coming my way.
Have you had a chance to peruse the options at all and see which player is the one you may want to get (if at all)?
If you say AK240ii......I'll shoot you....mostly out of jealousy....
Also, what kind of headphones are you using?
P.S. - If you like sticker shock, google the AK240 blue note edition..........hope you don't have blood pressure issues.....