Mine just arrived!!!
Absolutely fantastic. I've had an hour or so to get set up (took 2 mins) and have given everything a very quick whirl.
Essentially, I've got everything I love about my beloved VB99 in a pair of headphones (minus the GK pickup stuff).
I set everything flat, added a touch of Boss Limiter (same settings I use normally) and a tiny bit of reverb, turned the '3D' effect off, and bang, there it is - a beautifully full and detailed unadulterated bass sound.
I had a play with the 3D stuff, which I think will be great, especially when you turn your head and get a subtle impression of an amp in front of you.
It paired with my phone for playing along with music and the app itself seamlessly. I will probably use them as headphones even when I'm not using the transmitter.
I plugged the transmitter into the output of my Backbeat so I could feel the rumble and it was perfect - of course you can plug it right into your bass, or a pedal.
VERY little noise, barely audible and you know how picky I am about that.
I'm really really pleased with them. I'll do a full review once I've had a proper play - but this is basically my dream product!!