Hi DJO. In all honesty, there is no way for us to know whether the problems that caused a "Manufacturers Buyback" were corrected or not. And the previous experiences of another owner who purchased a "Manufacturers Buyback" would have no bearing on the condition or future performance of the particular vehicles you are looking at.
Sometimes, or most of the time, they may be. However, there is always the chance the problem was not corrected.
When we purchase a used vehicle, we take our chances. When we purchase a previous "Manufacturers Buyback" vehicle, we really take our chances, because we know it had issues before. Plus, with it being used, you would not have any Lemon Law protections.
If you decide to go with a "Manufacturers Buyback", make sure you have your warranty protections clearly spelled out in writing and understood.
Good luck with whatever you decide to do.