This is a product you can buy with confidence, it really works well. Good display, readable in sunlight, confirms that you have your heart rate monitor on and that the cadence sensor (if fitted) really is working. City Navigator picks up roads and even minor tracks in countryside and does a good if not perfect job of navigating around London. I sold my 305 to fund this and would recommend it as a first purchase or an upgrade. If you buy the cadence sensor and it eats batteries, get Garmin to replace it!