They were much better built than new ones but not great. Older ones around 2000 are much better. 

They are way better than the new ones but I think this was the second year they started using AFM, which I would never consider buying.  Stick with 2005 and earlier is my motto.

2007 marks the beginning of the 2nd Gen Silverado (2007-2014) and is when they offered cylinder deactivation (what GM calls Active Fuel Management or AFM) on all their V8’s except for the 4.8L V8 - growing pains especially in the early years adopting this technology. So I would pass on that truck. 2006 was the last model year for the 5.3L V8 in the Silverado before cylinder deactivation.

https://www.edmunds.com/chevrolet/silverado-1500/2007/review/