I would've preferred a bigger battery than extra thin. It's all about usability of the device.
I love mine. 128 GB Space gray wifi+cell. It feels like youre just holding a screen.
Its so thin and light and so so powerful. No game gives any problem and website loading is nearly instant on a fast wifi connection.
iPad new designs are every 3-4 years (remember when Jobs stated that consumer update cycle is 2 years for phones, 4 for tablets and 8 for tvs?)