Sick of the status quo?

There's not a lot to like about buying a used car the 'traditional' way.

You could end up with a lemon. More than you bargained for, and not in a good way.
You'll probably find yourself in a high pressure negotiation.  No one enjoys that.
You'll definitely waste a lot of time. Enjoy weekends at car yards or after hours meet ups with strangers?  No?  We didn't think so.
And buyer's remorse.  The sinking feeling you get when you realise you spent a lot of money on something that isn't what you need. Watch out for that.