My wife and I have ridden electric bicycles for years averaging 2000 miles per year. We currently ride Schwinn World GSE models that are no longer made but the rumor is that they may come back.
If we had to choose a new bike we would lean toward Currie Tech who makes several different models. We like their Path Plus model that is brand new for 2014.
On the plus side we could not ride anywhere near as much as we do without having electric bikes. They take approximately half of the effort and with our bad body parts they have saved us.
On the down side is the cost. Our batteries cost $600 each which is typical of the lithium ion batteries. Also, they are heavier than the non-electric bikes.
We like to ride paved bike trails especially Rails-to-trails that are usually shady and always flat.
Send me a PM if you need more info.