Brought one of these cycle computers a few years ago.
It has survived many seasons of horrible Welsh coastal weather.
The battery in the computer has only needed replacing once, and replacements nowadays are cheap.
The computer is easy to read, accurate, but you may find the average speed feature annoying, or what you base your overall performance on.
Two faults with the unit, not backlit and it is prone to interference, usually from certain types of traffic lights in cities, making your speed shoot up for a brief moment, it is not a huge problem, but can register your maximum speed feature worthless.
Overall, a very good unit, easy to install and use.