My
MoKo case arrived today, and I couldn't be happier with it. It fits around all four corners, so the Oasis is snug inside, but the long left side is not completely closed, making it relatively easy to pop out should I ever want to change the case or read without it (easy at least by way of comparison with my PW in its official case as well as my Voyage in the Hotcool case, both of which are difficult to remove). The sleep/wake function works perfectly, and the power button and charging port are completely accessible. Best of all, with the slippery metal back covered, I no longer have to worry about the Oasis slipping out of my hand while I'm reading.
The weight of the Oasis with the MoKo cover is 311 grams, making it 41 grams heavier than the weight of my Voyage with the very lightweight Hotcool case; however, thanks to the weighted design of the Oasis, it now feels much more comfortable to hold one-handed during long reading sessions.
I guess the downside would be that it's not a standing cover; however, as I never used or wanted one, that's not an issue for me. At the price point (about a third of what I paid for the official Amazon fabric cover before the price drop), I am quite pleased. I'm shipping the Amazon cover back today!