I have a 40 amp circuit, but the Siemens only outputs 30, so it is a little slower than some, but for what I consider a relatively reasonable cost, it should be adequate for our needs.
Two points: first, a 30 amp EVSE is all that you can safely and legally use on a 40 amp circuit, because of the 80% duty requirement. Second, and this is good news: the 30 amp EVSE will charge your car as fast as it can possibly charge on L-2, as the Leaf's on board charger is still limited to a 27.5A max charge rate.