thank you for the feedback. The vehicle I am looking at does not come with any warranty - is this something that I should consider buying (not sure from whom though)
I've got a Ford CPO warranty and it's been nothing but a nightmare. They employ the "delay, deny, defend" method every time you walk through the door. Deny the problem exists. Once they finally acknowledge it exists, delay the process to get it repaired. When you object, defend the actions that resulted in a simple repair taking many months to complete.
All of that said, I knew going in that warranties are designed to benefit the seller, not the buyer. I paid $800 for the CPO only because I knew it would require them to replace all 4 tires at the time of sale, which run about $800 for the set. Thus, I was already even when I started out and I figured anything repaired beyond that was a bonus. They tried to weasel out of replacing them of course, but I referred them to the terms of the CPO, showed them the actual remaining tread using a tread depth gauge, and told them I would not accept delivery until there were 4 new tires on the vehicle.
Personally, I think you're better off pocketing that extra money that the warranty would cost you and saving in just in case something needs to be repaired. The exception would be if you see something that the vehicle needs right now that would unambiguously be covered by the warranty. Then you may want to weigh the cost of repairing/replacing that item (or items) versus the cost of the warranty.
Just be sure to test
everything before signing the papers. Check the power running boards and make sure they aren't deploying very slowly or making any sickly groans or whines, as these are signs that they are on their way out. Make sure every button on the control panels functions and does what they should. Test the AC and heat. Test the steering wheel controls. Test the rear hatch. Climb up on the running boards and check the roof for rust. You're likely to find some, but determine whether the amount makes you want to walk away or use it as a bargaining tool. Check under the hood and at the tailgate for bubbling as well.