I own a 2016 JTV-59, but I also have a Variax 700 and a 700 acoustic... They still work perfectly, still sound amazing, and play like a dream. So I think you can trust a 2011 JTV-59... as long as it wasn't abused by the previous owner. It will accept the latest firmware update (that is if it hasn't been updated already). I'm running v2.21 and have no problems... Sounds fantastic. As for circuit board replacement... really not worth it. Like psarkissian said: It corrects "a few minor things" that you probably wouldn't even notice. Most important is the JTV-59 is still in production, so complete service is available should you need it. They're wonderful guitars whether 2011 or 2017.