I am using ione with the ipower 5v and my personal opinion is that I have seen great improvement by using the ipower adapter. Although they have the same cancellation noise technology in ione with the ipower a good power supply increase substantially the sound quality for ione. By placing the first version of ione in the top rack and with some of my devices in relative good distance I can use adequately Bluetooth. However, according to my opinion Bluetooth is not for prime time yet sound quality wise. It needs maybe Bluetooth 5 or new formats. I cannot even compare the quality coming from my USBRIDGE with Bluetooth. Bluetooth is more convenient for sure but not sufficiently enough to compensate for the amazing quality I am getting from a usbridge or my raspberry pi. Nevertheless, ione has the best Bluetooth implementation sound quality wise in the market especially for iPhones/iPads with the aac format. Another observation is that the ione has the functionality of the ipurifier for spdif but I am not sure for the usb input. That was a question in a previous post but I think never answered. I made the following comparison: laptop usb to nuforce usb to spdif converter then to ione Vs laptop directly to ione usb. Suprinsingly, The former had a more open better sound. I am not claiming that ione should have included a better RCA cable for free but a reasonable investment for an rca improves the sound even further. And in contrast with the whathifi review after burn in and with a chord c-line cable I am finding the ione signature slightly warm. Even further, I use a cheap Chinese tube preamp with some nos mullard valves with a 12v ifi ipower and the sound is not only warm but you can say properly hot.... All in all, The spdif implementation for me is perfect 11 out of 10. The usb input still produces the best sound quality with the appropriate care. The whathifi review is a joke. The ione is great for 200£ I am looking forward for a 400£ black version so to accommodate more ifi technologies in one convenient package which has more inputs, straight DC input, a remote control, a streamer maybe and the aluminium enclosure of the first version. Amazing device, this is a first version of an innovative product, we cannot expect everything perfect from the first versions, I hope ifi takes our feedback in good spirit for future product offerings.