Still using the one I got on launch day. It is noticeably slower, but it works fine for my wife to shop online, post on Facebook, check her email, and send messages. I do have to say I felt just a little let down by Apple when they announced the 4th gen just a few months after I got mine. It feels like the 3rd gen was a stopgap device released just so Apple could claim a retina display on the iPad but Apple wasn't ready with the A6 chipset yet.
I suspect I'll wind up replacing it later this year when the 2017 iPad likely is one of the Black Friday sale items and I can get a $50 gift card along with the purchase. I'm still kicking myself for not grabbing an iPad Air 2 when they were selling for $299.