Bought one to use with usb out of my iPad camera connection kit. When I tried it the Ipad's usb bus couldn't power the dac. I knew this might happen but I wasn't too worried as PD offers a 30 day money back guarantee. Only problem is they have so far ( about 2 weeks) been unwilling to give me an address to return it to. Anyway, I watched Jude's review of the XM 6 again, and I agree-this is not going to replace my desktop amp. But-it has all sorts of neat features as pointed out by Jude. It can be used as a torch. Is it going to replace my keyring torch? again-no. It's certainly not going to replace my SR 71 B or ALO continental. Maybe a paperweight? But then it's not that good looking-and it's a bit pricey for that purpose. Maybe not such a practical device after all. Pretty shabby for a HeadFi sponsor.