Technical Support wrote:
Right now, we are stating a 6-10 day lead time for Einstein on our website. However, if the D1 firmware has the "Bt" mode, you should be able to use the VML with those.
I checked and my D1's have the Bt mode and I ordered a VML today, will be here Thursday.
I have power available at weddings, I just really like being able to not hunt for it and keep everything portable.
If this works with my D1' I will buy a few of them and I am sure my colleagues will also.
I will later check out the einstein's for sports, many of the fellow MaxPrep photographers seem to like them.