Does anyone here have any experience of Cowon iAudio DAPs, specifically re sound quality, and also reliability/longevity?

I am thinking of purchasing either a D2 or an i7, both of which have good reviews of sound quality, albeit from sites which may be somewhat biased!

Some forum posters rate the sound of the Cowons as being "cold", others say it is great.

I am interested in the Cowon players because of their excellent audio codec support and terrific battery life, and the fact that they are easily available here.

Another DAP that I think would be great is the Trekstor Vibez but it seems to be rather hard to get in Australia.

Thanks.