It's been close to 3 years since the 5th generation touch was released in 2012. I purchased the scaled down 5th generation model without the rear camera when it was first available in May 2013. I mainly purchased it to listen to music while working out at the gym. The gym has wifi so I can listen to Pandora, Spotify, etc. I also use it while bike riding or jogging. So basically it's a workout tool for me. The only other time I use it is to play music on my Sony bluetooth speaker. All the other things like taking pictures, reading ebooks or browsing the web I can do on the much larger screen of my phone. Besides more powerful hardware nothing much has changed. My 5th generation does what I need it to do pefectly. No need for me to upgrade. The only downside is that the battery does not last as long as it use to but it last long enough. I'm a Andriod guy and this is my only Apple device. My wife has. Ipad mini 2 though. Check out the 5 vs 6 generation comparisons in the link.
http://www.gizmag.com/ipod-touch-6g-vs-5g/38521/