Fostex HP-P1

Best i-Device portable DAC ever listened to, very neutral and smooth like from a desktop DAC. Currently using it with my iPod touch 5 (Yes, it's support lightinig connector). I will prefer filter (2) than (1) as (1) is more flatter. Built-in amp is not powerful enough to drives some headphones, currently I using SE535 and Bowers & Wilkins P7 both headphones sounded perfect with HP-P1.
 
Now battery is the most problem given to me. After 6 months I get HP-P1, the battery seems to be not function at all but under warranty my dealer change it a whole new one for me, but after a year plus the battery seems to have some charging problem, after 20 to 30mins of charging time the battery light keep blinking and won't charge at all, sent back to my dealer this time out of warranty for about 6 months, finally my dealer said that Fostex have to charge me about $323 to replace some sort of chips and board so I decided not to repair it, now while I charging if the light start blinking I have to plug out and in again to get charge. 
 
Overall It is worth buying it? while it's depends on yourself because out there, there is cheaper and average good sounding portable DAC to choose, but if you want an awesome sounding portable i-device DAC you should give it a try, it will make your i-device becomes a Hifi i-device.

I've bought it for 489.90 euros and worth them all, the materials are magnificent (the Fostex is MADE IN JAPAN), DAC reader, 160 mW, 2 filters and 3 types of gain.
I've listened it for about 2 weeks, so I can say that the sound quality of this portable amplifier are absolute perfection (FOR ME), if you are searching of the maximum perfection and of maximum audiophile sound quality, the Fostex is probably not for you, the Fostex costs about 500$, there are other better portable amplifiers for over 1000$, but for 500$ the Fostex beats them all.
Apart the fact that the Fostex is a little bit big, i can't find any defect.

Just received it. Sounds amazing with my current phones. The 2 filter options are really handy to help taper off phones that had too much of a treble spike (using filter 1), while the "flatter" sounding phones sounded awesome with filter 2.
 
Soundstage improvements aren't that noticeable compared to my iQube width wise. But there is a noticeable improvement in the layering of depth in the soundstage. Helps with imaging and makes everything that much more "3D".
 
Going to spend a couple of weeks listening to it and report back~