Keeping in mind that I'm a bit of a technofreak AND a mechanic for a living, lets take in a simple bike tour or unsupported long distance ride. Did you remember to bring your charger, add to the list of things you must carry a spare battery? Damn, no outlet to plug my charger into while sleeping/resting along the way.

I can't tell you the number of times I've seen a piece of equipment start up for the last time due to catastrophic battery failure. Granted, these are the more common lead acid batteries found in cars but still something to keep in mind.

Ah, Bluetooth, back to interference. Works real good when it works, sucks when it doesn't. Trust me I love this stuff, pay me now, or pay me later.

CVT may be the better way to go as far as overall reliability is concerned.