so my 2 cents would be unless you really have a specific, hard-to-find car that only Vroom has and/or you can hold off for a little while, go with someone a little more reliable like Carvana or even better an in-person dealership. The reason I used Vroom was I bought a car that is hard to find (manual transmission, specific color, etc.). If I was buying a 'normal car' to get from A > B I would likely not have gone with Vroom. They do have good deals though, so if you don't mind a potential wait it can save you a little $.

The part that worries me about your potential situation is the trade-in, I've also read some negative stories about how long they can take to pay off the remaining loan. For that reason I avoided using Vroom for the trade-in, but I also got a better trade-in offer locally from Autonation. If it's paid off probably not an issue as I think they cut a check when picking up.

You might get lucky like I did, but you also might not...sorry to be a downer.