I fitted the ESR Shift today. They did a good job on the inner case. It is a snug fit, with good hole alignment, and responsive buttons. The outer folio stand, which enables all the various angles and positions does add a lot of bulk. The magnets which hold the back of the case to the folio are really strong and secure. It is nice to be able to easily detach the folio but still have the protection of the inner case. However, the magnets are quite weak for the front cover, they cannot hold it closed and the front slides about very easily. The wake/sleep function does work OK though. There is no microfibre material on the inside of the front cover.
The raised screen position is really nice for desk use, I can see me using that a lot. Portrait mode is also useful, but the magnets only work with the USB-C port orientated to the bottom, so it is not possible to charge or sync by cable whilst in this orientation.
The stretchy fabric stylus pouch on the rear is a little weird and of no use to me. I wish this was removable.
I imagine the ZUGU will be higher quality overall, but likely loses out on some of the functional flexibility. I'm interested to see how that turns out.