Light is good, holders are poorly ...

As a customer you always expected a good product that you own for a long time (namely, the front light IXON IQ and taillight IXBACK senso), can be eventually replaced by an even better. This new combo set "IXON Core + IXXI" of Busch & Müller, however, this was not the case.

The advantages: Positive improvement is the built-in lithium battery with the front lamp and the rear light (in taillights of B & M there has been no battery yet). So goes a charging cable to charge the front or rear light. If you have the charger cable traveling times not there, you can use other USB cable for charging. The long burning time, the good illumination of the front lamp and the good brightness of both lamps is another plus. Both front and rear light shine sideways: the road very useful, then you will be seen even from the side.
The size and the light weight of the two lamps are so good that they can practically always carry in your pocket or backpack.

The cons: The assembly of both lamps is done with the supplied straps (silicone / rubber band). The holder of the front lamp is mounted quickly. However, the attached to the bottom of the bracket silicone gasket (to protect the handlebar from scratches) already so loosely fitted while unpacking that she will leave soon probably in regular use. But the front lamp may be difficult to attach the support arm (it is inserted laterally and only with a lot of pressure). Here, the entire bracket and the strap shifts, so everything slips on the handlebars back and forth. The use of smaller clamping band (which is really only difficult to install) brings no improvement. (Press safety lever and slide out the side lamp) The release of the lamp from the holder also go very hard, thus the tension band and the whole mount slides back and forth. A fixed mount on the handlebar, to which one can easily attach the lamp, here would be more appropriate.
The rear lamp sits in a silicone case, which the USB port is protected and can occur no paint scratches on the wheel. However, the tail lamp is held only by a tensioning band. That may be ok if you let the lamp to charge always at the wheel. But when you park your bike somewhere and followed, will you also take the expensive clip-lamps in order to prevent theft. The strap is not firmly attached to the lamp, but loose. Since it can happen quickly that it is lost ... then there is no way to fix the lamp. So here is lacking a permanent fixture that is always at the wheel, where you can set up and disconnect the taillight easily. Or even better strap that is connected on one side fixed to the lamp so that you can not lose it.

Conclusion: size, brightness, "all-round visibility" on the road, and burning time of both lamps are good, charging via USB cable also. In the case of the holders but too much has been saved. If are not easy to install plug-in lamps for regular use and remove it again, and they sit on shaky on the holders, then the long-term use will probably not be fun.