The VDO A4+ is a relatively inexpensive wireless computer. It doesn't have a huge number of functions, but it is good enough to make us think that VDO could charge more.
Setting up the A4+ is quick and easy, partly thanks to simple instructions. It has a simple bracket which allows it to be mounted on a bar or stem. We had to position the sensor relatively close to the magnet.
The range is long to cope with it being mounted further down the fork leg to make spacing between sensor and magnet easy to achieve.
The two buttons have a positive action, although when riding only 'Mode' is used. Because it only has a few functions, finding the information you need is easy. There are smaller sensors out there, but the A23 battery should give the A4+ plenty of life.