It has been my experience that when buying anything for your bike, except maybe tubes, it is always better to get the brand you don't have reason to question, even with the higher price point. This is a classic example. The $20.00 dollar computer is sketchy at best. If you were to go to your lbs and find a $30.00 one of a better brand the problems would almost definitely go away completely. My $25.00 cateye I bought 7 or so years ago is still going strong, as is the $35.00 dollar top peak floor pump I bought after going through two Bell brand pumps from wally world, neither of which lasted more than one or two uses. A great rule of thumb is: if you have need to question the quality, then you shouldn't be asking the question and need to move on.