B & M ... was expecting more!

The charging cable (USB MicroUSB) of course does not fit to the other products.
It is simply through the second component (the cable) distressing because you usually do not feel like even thinking about Extrakabelage.

The light output of IXXI I would consider mediocre.
Positive is the viewing angle is very large, so can also be seen from the side view.
It has a LED which is not particularly bright.

For comparison, I have two other taillights:

Knog Blinder (insanely bright LED - folding - plug on the lamp, small beam angle, quite large)
Sigma Hiro (normal light, battery ca 1 year, smaller viewing angle, unstable attachment)

The fixing of IXXI is okay, the elastic band is a little tight.

I welcome the compact size of IXXI.

All in all a let down, it is now in the reserve box and I'm still looking for the best taillight.