I am an owner of the 5909, but I have been looking at the T+A solitaires for quite a while, so I have no thoughts, but I would be quite interested in your comparison :)

Alright here are the results: The ML 5909 works with Windows 11 without the dongle, it pairs easily and has a stable connection. The 200ms latency is also gone, you can now watch movies/youtube without dongle. But at least on my device (Lenovo Legion Slim 5) I had a lot of pops and clicks, like...

With windows 10 I used the Sennheiser Bluetooth Dongle (BTD600), otherwise I would have severe lag (200ms) which was unbearable for movies/youtube. I just updated to windows 11 yesterday, I can try later today and let you know if there is any improvement and the dongle isnt needed anymore.

I fixed the issue with a Laptop, but I am still figuring out how to connect directly to an iPhone, is it possible via Lightning to USB-C cable or do I need a DAC? Technically the 5909 has an integrated dac, shouldn't that work?

Ah did not know that, I was using an off-brand USB Cable, thanks!

I bought the 5909 a couple of weeks ago on sale for 550 and I am very satisfied so far. But I wanted to try how it sounds via USB, but I could not get it to work. I plugged it directly into my iPhone via USB-C to Lightning Cable, but the phone did not recognize the 5909 as an audio device. On my...