I bought a 2013 Equinox new and I am happy with it. That said, I would not buy one used especially with the 2.4 DI 4 cyl. The pistons, rings, and a timing chain were replaced at 42k miles 3 years ago due to excessive oil consumption (1 qt/1500 miles) due to premature oil control ring wear. The repair was under warranty so no out of pocket cost. I have not had any problems since the rebuild, but I checked and maintained the oil level religiously once I noticed the level dropping starting between the 20 - 25k oil changes. There is plenty of info on the net about Equinox issues.
This thread has the details.
Note the oil consumption issue was for 2010 to 2012 models, I bought my 2013 in Nov. 2012 so I may have caught the tail end of it. The 2014 may be okay, but I would want a complete vehicle history and an inspection before buying one used.
Ed B.