Finally got my 5k today! Initial impressions are that I'm well, impressed.
I'm by no means a skilled analyzer of audio, and I'm sure there could be some confirmation bias, but I think it sounds noticeably better than the FiiO BTR1K it's replacing, even to my casual ears. From a price and spec standpoint it's not really a fair device to compare the 5k to, but I'd say the 5k is noticeably clearer sounding, with better instrument separation and depth to the sound stage.
More importantly to me, the build quality seems rock solid. I don't think I need to have any fear of breaking the clip, and even more important the connectivity is massively better.
Presumably FiiO screwed the BT antenna or some other design element of the BTR1K because it would drop connection through my body. I tended to keep phone in left pocket and adapter in right, and just bending over to pick something up - especially if I squatted down, audio would cut. I'm definitely not thicc enough to justify that much signal loss between pockets, and since I'm a diyer who's constantly on the move and up and down working on projects, fixing things around the house, I was constantly experiencing audio cuts with the BTR. At first I just clipped it to my pocket above my phone, but 3 months in the clip broke so it had to live in the other pocket and it's been pretty miserable since.
With the 5k, I can set my phone on my desk and walk to my kitchen and maintain connection. Signal is going through ~3/4 walls around a brick fire place and I'm about 70ft away. Of course solid connection between pockets. I am content.
