Disclaimer: I work for Nuforce.
Instead of sounding off whether it is worth it, people like "SoldOnApple" or "Yukster" can just order it from our online store on Amazon.com and give it a try. Shipping is free. 30 day money back guarantee.
I won't go into the issue with uDAC-2 measurement (there is a long discussion on head-fi.org). I think too many people are jumping into conclusion without bothering to try it for themselves ("blackburn" have you actually listen to uDAC-2?). We have at least two customers who wrote us feedback that they tried uDAC-2 after reading NWAVGuy's one-sided report and even tried his solution. They ended up keeping uDAC-2. There are about six 1 to 2 stars bad rating of uDAC-2 on Amazon.com, balanced with 46 5-stars and many 4 stars reviews. Audio is subjective and some people just can't tell the difference.
My point is this: try it and make your own judgment.
We started out as an audiophile high-end company, but we do have serious science behind (owned 4 US Patents, one of the Class-D amp).
For the 1st 5 people who give it a try but don't think iDo will make a big difference in your headphones listening, we will even pay for your return shipping. Just quote this posting.
There are many people who listening to music at work, but can only use their personal iPhone, iPod or iPad for music instead of office computer. This is where iDo will make the listening experience much more enjoyable.
iPad + iDo + active speakers make a very good quality system at home.
I read magazines and watch movies on bed with my iPad, so it is nice to have iDo charging iPad and listen to high quality audio through iDo.
If I do have a chance to listen it I will, since most sources have troubles with my ie 8 sensibility (mostly hiss problems, got rid of my walkman due to excessive hiss).
I'm not afraid to experiment new gear like I'm most likely to dump mac os x after this lion crap (I'm not loyal to any brand). The main problem is that is near impossible to experiment gear without having to buy it here (people used and abused the stores return policy, so now many products can't be returned unless their are defective), and I still need to buy at least an amp for my hd555 since my ipod can't drive it properly (most likely due to the eu volume cap).
And yes audio is very subjective, some friends of mine like to use those crappy eq presets that distort audio on their ipods. And I'm not even risking to buying expensive stuff without trying it first, and since I'm a student I (unfortunately) don't really have money to spend in dacs since my macbook is starting to go bad and I'm out on warranty since I've dropped it.
If I do have the chance to try it like many products that I've tried before, I'll try. If I don't spend a dime on testing it I don't really care if the reviews are great or not its always great to test new stuff. Too bad there aren't many audio stores with more consumer stuff (only professional stage equipment).
But proper measurements never hurt anybody and I think that measurements should be available for every product.