Mercedes-Benz's new A-Class E-Cell may be a limited production vehicle, but it is a production vehicle, which likely means that some folks will be interested in how it actually drives. Thankfully, the folks from PluginCars have now managed to take one for a quick spin, and have delivered a few first impressions. The short of it is that while it's a "nice ride," it's apparently not a very powerful one -- in fact, the site says that the car felt "significantly slower" than the Nissan Leaf, which also of course has the advantage of being cheaper and more wid