I did, two weeks ago.
Got a great deal when upgrading and my 5s covered the cost plus cash in my pocket. It's not that money was a "limitation", and I think people need to stop making the assumption on here that people buying the previous gen iPhone are "poor". It's popped up in a few threads now.
I had the 5s, which I didn't find slow at all, I just wanted the bigger screen and Pay.
Having the latest and greatest iPhone isn't overly important at this time, especially with home renovation and our third trip to Sorrento, Naples in 2 years to be paid for.
So, money isn't a "limitation", it's simply paying for other, more important, luxuries at the moment and I got a far better deal on the 6 than I would have the 6s. I'm simply choosing to prioritise my money.
Bottom line, I'd rather be enjoying good wine and food on the slopes of Vesuvius again than have the latest and greatest iPhone.