The general response from regular users of bicycle radars is overwhelmingly positive. Understand that these forums are disproportionately represented by a much older demographic than the typical cycling community, which explains the preponderance of concerns about charging and the preference for mirrors. You can easily get 16 hours out of an older model and 24 hours from the current Varia 820. Charging is just part of everyday life, and frankly, I don't understand the phobia. I usually tour with a phone, a Garmin Edge 1050, an iPad, and a Varia. I usually also carry a battery pack that charges through the device; it's always full, and if power is disconnected, it completes charging on the device.