Yes, interesting to the press release announcing the partnership. A pity that the partnership does not extend to actually providing a seamless and positive experience. I would not have chosen to do business with East Coast, even prior to yesterday's experience. I stick to the global brands we all know and love, as I thought I was doing here. As stated in the original post, no mention (that I was able to discern) was given on the Sixt website or email confirmation indicating that I was doing business with any entity other than Sixt. Of course, cross-referencing the address would have quickly shown the link to East Coast.

If I contact Sixt to share the details, I will share the outcome.