Can’t comment on the Logitech one however demoed the Harman Kardan one in Richer Sounds and was left rather unimpressed by the sound (mp3 quality and other arguments aside) it was just very low in volume and rather poor sounding. Was plugged into an Arcam FMJ and some Monitor Audio BX5’s from memory.
The LG soundbar we have recently picked up which also has Bluetooth built in is far superior sounding which surprised me.
Obviously that’s of little use if you’ve a good stereo set up you want to take advantage of. I just ended up buying an RCa to 3.5mm cable instead for a damn site less for the occasions I want it coming out the stereo. Will probably pick up a dedicated DAC at some point.
Appreciate that might not help too much but from personanal recent experience I’m not sold on the BT receivers such as you mention, I tried.