Finally got the K8 delivered, and my first impressions are good. It has a slightly leaner sound than the S5, and I'm using the equaliser to set it to what I want. The screen is the usual low res, but at least I can see my album art. The radio is not as good as the S5, and it struggles to find stations, and there can be too much noise at times making me switch it off. Build quality is ok, but I've only had it a couple of days, and already I can see some of the red paint from around the edges flake off. A trait not to uncommon with the S5 too. I've not run it long enough to check the battery, but it did come charged, and I have ran it for at least 8 hours and there has been minimal drop in the battery life. Bluetooth. I connected it to my Yamaha hifi. It took a few goes, but it finally connected, but I was not able to play from the folder view. I had to let the player scan my card and play from the Bluetooth folder. Sound quality was OK, and I suffered no drop outs in the half hour I used it, but, this may be me, all the songs in every album were out of order when playing through Bluetooth, which was annoying.
Well worth the £23.