Thank you for the kind welcome
We just mounted our motor on the '09 on Friday, so we haven't gotten a whole lot of riding time on it yet. But I can talk about the '08 in regards to riding time as the battery is virtually the same.
As you probably know, lithium-ion batteries are much more resistant to temperature extremes than lead acid or NiMH. Also, the thermal cooling on the Zero's Zenergy pack is amazing; the batteries have never even gotten warm to the touch, NEVER.
We are up in the mountains of Colorado, and while we haven't done a ton of riding this winter, we haven't noticed too much of a range difference from the cold.
In general we try to avoid using the whole charge from a pack. We bought a spare pack and usually switch them out when we get around a 50% charge (best for life of battery).
The day we filmed this video-
we had people on it from around 1pm-5:30pm, one after the other and went through about two packs worth of juice.
The bike can easily handle a 25 mile commute (bring your charger or buy a spare) and riding time is fairly consistent as long as you're not wide open, straight uphill a majority of the time.
It really is an amazing bike and a totally unique experience. Getting people who've ridden it to accept the ride time is not that hard. What is more difficult is getting people to understand what it really is. It is not an MX bike. It's not like any bike you've ridden before. I've started comparing it to those speeder bikes in Return of the Jedi (
http://gas-holes.blogspot.com/2009/02/zero-impressions.html), because that is the closest feeling I can think of