Just received my Thinksound On2, wow, they exceeded my expectations, and that's without any burn-in - last weekend i was auditioning some headphones in the local mall, ATH M50X, ATH M40X, ATH MSR7, Sennheiser HD599, and Beyerdynamic T51i, and i gotta say the On2 blows them all away. Of course the Senn's have larger soundstage and the ATH M50 bass extends slightly more, but the On2 sound the most complete to me, good frequency extension on both ends, and very clear and detailed mids, plus they are beautiful, light and portable. The ultimate test is the goosebumps test, and I did get some goosebumps playing one of my favorite songs on them.
Not exactly chi-fi, but just wanted to share my impressions
For anyone considering a chi-fi that cost close to $100, do your selves a favor and get the On2 instead, they were only $115.