I'm driving a Benzhou electric scooter for half a year now. Rated for 45 km/h top speed, 50 km range.
It handles the 13km round-trip to and from work beautifully, and has done the odd 40km-trip now and then. That's about the maximum I would use it for, as the battery starts to degrade quite noticeably at that point and I don't feel like "stranding" a couple of klicks from home.
There are other models from that manufacturer, including higher speeds and longer ranges.
Manufacture quality is what I would call "standard issue" for scooters, perhaps a little bit sub-par. (Some parts started rusting right away once they got wet the first time, but I was able to counter that with some spit, polish, and a regular coating with some oil.)
Power consumption is roughly 6 kWh per 100 km, giving me a cost of 1,80 Euro / 100 km, which compares quite favourably with the ~5 Euro / 100 km for a petrol scooter (or the much higher cost of a car).
Since any electric vehicle you could get your hands on at this time is always more expensive to buy than a petrol alternative (simply due to market forces), the best you can hope for is to achieve some kind of a break-even.
The scooter did cost me 1300,- Euro on eBay (including top case, shipment), while a regular scooter would cost about 600-700 Euro here (Germany). The chances of breaking even, on my 8000 km / year regime, are slim.
BUT, pt. 2...
There are many upsides, IMHO, to an electric vehicle. You get the better well-to-wheel efficiency. You get a next-to-nonexistent noise emission (gliding through a residential area at night, thinging about the hubbub your average petrol scooter generates, is *cool*). You get less moving parts, no engine oil - translating to higher life-expectancy of the vehicle and lower maintenance cost. You safe the trip to the gas station (which might be a factor for you or not). You get lots of turning heads... and you can rest easy when they talk about rising gas prices (again).