I bought the 70D new. After research and reading about the possible AF issues, I wanted to make sure I had a good unused copy with a warranty. I started my search because I wanted a good crop-sensor camera for lowlight with a fast AF. The FIRST day I used it was at a wedding. I got there early to do some tests and ended up using it the entire night! It was focusing VERY fast and VERY accurate in extremely low light even when not assisted by the AF assist beam on my flash! I also did not need to do any AFMA with my Sigma 17-50 f2.8.
I love the interface and the AF modes. The rotating rear screen does come in very handy for high/low angle shots; especially helpful when you have been shooting for several hours and want to save your back! lol
I have small hands and it fits well in them. This is probably the largest camera I would be comfortable using for an extended period of time.
The wifi function is pretty handy with the smart phone app. It does have some lag though. It's nice for self and self-family portraits as a wireless remote. It's also nice to have instant access to the photos you just took so you can upload them to social media!
Overall, VERY happy with this purchase. Definitely NO AF issues here!