Got a question for frequent Apple upgraders. For my Macs I typically get a new one when I feel that my old mac is due for an upgrade and seems like it's slowing my workflow. For my ios devices I'm always upgrading whenever there is a new device. However for iPad I've upgraded every generation except for the 4th generation iPad, because to me it really felt like a useless upgrade. If you're a serial upgrader, which iPad have you skipped?