Financing question

How accurate is the “$___/mo. estimate” on Tesla’s site?

I just find it so hard to believe that a ≈$50k car, with hardly any down, for 72mo, with “fair” credit that the payment is going to be anything less than a thousand / month. How on Earth are they offering 4.49% APR with those terms?… or is that just how it is with Tesla and I’m just used to being robbed by conventional dealerships my whole life?
What’s y’all’s experience like? I’m really wanting to make the switch, but I’d hate to put too much faith in to the estimator and drop a big “non-refundable order fee” only to find out their estimates are way off and I’m out the cash and a hard credit pull on my account.
Thanks!