My charger arrived yesterday with the 6-50 plug option. I got the feeling more people were asking for 14-50 so I took the chance that 6-50 may come faster. Ultimately the 14-50 just costs more to install with no benefit.
I took delivery of my FE on February 14th. I got the email requesting my address on February 17th. They provided tracking February 25th and I received February 28th. I did email them a couple a times, which I think may have helped push mine through.
I was going to hard wire to the box, but my run is about 50 feet and conduit would have been much more expensive. Then I considered using NM 6/2 wire and hardwire to a 60 amp breaker. Technically you can protect 6/2 NM wire with a 60 amp breaker, even though it is 55 amp rated provided the load is below 80%. Some electrical inspectors may not let it pass. Ultimately I got concerned about my breaker panel capacity. I have 200 amp service, but I have a hot water heater, AC unit, double wall oven and swim spa on the panel. In the end, I have decided to use a 50 amp panel breaker, 6/2 NM wire and 6-50 receptacle. This also makes it easy to remove the charger or replace it in the future. There is a minor hit to charge time moving from hard wired to 50 amp receptacle, but it isn't enough to be concerned with.
My material cost for a 50 foot run, receptacle and breaker is around $160. I have electrical education and work for one of the largest circuit breaker companies in the world, so I am very comfortable doing the work myself. Just be aware that voltage/current in an electrical panel is enough to kill you. Turn off your main panel breaker before adding, replacing or moving any circuit breaker. Only perform electrical work with circuits off and verify they off with a meter.