sorry to threadmine but i thought this might be of use to someone.
ive had a couple of weeks to compare my GS-1 to the C320BEE I was using for about a year prior. Initially, I was tihnking "hmm i may have wasted my money on the gs-1" it didnt seem to change the sound much, and have less bass.
after a fair bit of listening, it is clear just how accurate the gs-1 is to the source. the soundstage is preserved, the detail is amazing, the thing can be turned up loud and exhibit no distortion or any problems. the quality of recording is the only factor in whether something sounds good out of the GS-1. a brilliant recording is sublime, and average one is very noticeable. so it is a revealing amp, and one i dont really want to sign off on until ive got a couple more phones to play with. (Paduak Darth Beyer's on the way
) Mainly because you can feel the flatness in the mid bass of the DT880's, and so a large portion of my music isnt jumping out as it would with other phones.
The C320BEE served me well for a year, on admittedly not great headphones (HD200's, HD570's) but even with the zhaolu into the NAD with the dt880's, it is very, very good value. it seems to bloat the bass out, and at higher volumes does distort in a way that is non existent with the GS-1. It is however a really fun and cheap amp for rock etc. it reduces the soundstage of the zhaolu noticeably, but in all this youre comparing a 700+ phone amp to a 300dollar integrated
i dont regret buying the thing, because for the money its awesome and drives my average speakers perfectly well, which is what i wanted. Im sure you could pick one of these up for less than 300USD, i bought mine for less than that in aust a year ago.