Okay, the pictures and full assessment are in!
Velcro closure for the handles seems sturdy, as does the zipper. The zipper maintains a secure seal between the top and body of the case, and the cover itself should be able to withstand plenty of use, and a little abuse.
The pocket on the front is big enough from top to bottom and side to side, but it has virtually no depth to it. It will handle a thin book or a handful of sheets of paper, and not much more.
As you can see, there is little room to spare beside the headstock and tuners, but there is little to no wiggle of the guitar, so I am calling it an efficient use of space. The hinges are made of plastic, and as such "may" be prone to the effects of stress over time, but we shall see. The good news, from what I have found online, is that they are relatively easy to replace if necessary, and I am not a high stress user, so I am not concerned.
Zero wiggle room at the upper bout, and what can't be seen from this photo is what amounts to a cutout for the neck heel, so that the guitar fits securely.
Zero wiggle room at the lower bout as well. There is not a cutout for the strap button, and that would not be a bad update, but as securely as the guitar fits it shouldn't be an issue. And for the only real issue I have with this case, notice the strap that secures the top of the case to the body, and then notice the protruding tongue just below it that fits into the groove on the top to create a thermal seal. The strap is outside of the tongue, and when closing the case that strap gets folded across the tongue and onto the guitar. As the case closes that strap gets wedged between the tongue and groove thereby slightly compromising the seal at that location. Over time what effect will that have on the overall seal? It would be nice if there was a way to attach the strap to the inside of the tongue and groove so that it does not interfere with the seal.
Here you can see the accommodation for the neck heel.
D rings for the back straps seem sturdy enough.
The inner storage compartment is very spacious.
So there it is. Ultimately, this appears to be a very good option for an ES-175 or CE-100.