I just looked, will they try to charge us this payment on our replacement units?
What makes you think no?
This is the down payment for a purchase. They aren't going to charge you again for getting a replacement for a recall.
It still says out of stock on Tmobile site so I think it doesn't mean much. It is BS if they start selling them before we get to swap ours out. I'll probably be driving 30-60 miles to get one now since my county's only tmobile store usually always runs low on stock.