I've been looking into getting one. Tried one out yesterday and it was far nicer/zippier than I presumed. It looks like it definitely would be able to take me to work comfortably, the current distance is a bit too far for me to make on my own.
Luckily my SO and sister dragged me away else I would totally have impulse-bought a new ebike.
An update on this a year on - I ended up buying a folding electric bike about a month after I made that post and have been hooning about town on it since. (The Perth mustachians can confirm this - I think I've ridden it to every meetup since I've had it).
While I can't say I ride to work every day (I think I average about 2-3 days a week, there was a period of about 2-3 months where I had a recurring chest infection so didn't feel up to riding at all), it's my first choice when I need to run errands. I've also found it as fast or faster than a lot of the more 'normal' options, too - I took it into the city to look at an art exhibition with my friend, we said goodbye at the city train station only for me to ride past her walking home from the station near her house about 20 minutes later (the cycle path runs parallel to the railway line).
The fact it folds is really useful, I'm glad my husband talked me into getting the folding model because it means I can do things like ride about all day running errands, meet up with my husband at a friends house or the pub and we'll fold it up and put into the boot of his car. Or if I need to, I can bring it on the train in peak out so long as it's folded (you normally can't bring a bike on the train with you during peak hour).
That being said, there is a downside - hot weather seems to kill the battery. I've had it conk out on me a handful of times, either because I forgot to charge it or due to really hot weather. In those cases, though, it's not the end of the world - it's heavy as sin so it sucks to ride home, but it's doable. Or if I'm really far out I can always fold it and take it on the train or call an uber/my husband to come pick me up.
Another downside - you have to bring everything with you.
Everything. All the things. On Thursdays I ride to work with three different sets of clothing - one for riding, one for work, one for judo. Then there's also the usual stuff like lunch, maybe breakfast and coffee, etc. None of these things are particularly heavy, it's just bulky and a heap of organisation making sure it's all nicely packed into the pannier bags in a logical manner.
But overall I'm enjoying it!