I have been using the BoomBoom 100 with the BoomBoom 577 headphones for 1 month now and I am satisfied with it.
It was also very important to me that I have absolutely no delay in the transmission and this has been 100% fulfilled.
I am glad that I chose the 100 model. A colleague of mine has the cheaper model of the BoomBoom and has confirmed that he always has a very slight delay. I hope this helps with the decision. Greetings Roger
It only switches off completely when the mains plug is pulled out, but this is not annoying (only flashing display) because another device is only connected in pairing mode anyway. I am very satisfied with the device, it works perfectly.