Whats the real-world benefit of integrated GPS in bike computers, and is it worth the premium price and potential battery life trade-offs, or are separate GPS devices still the way to go for serious cyclists who need accuracy and reliability? Doesnt the added weight and complexity of built-in GPS units just increase the likelihood of hardware failures and decrease overall system flexibility? Are the supposed convenience benefits of all-in-one units really worth sacrificing customization options and the ability to easily upgrade individual components?