As an owner of a high-end classical guitar, I was fed up carrying a hard-case shell for my guitar, a backpack for the scores, ErgoPlay, Footrest and the likes and a music stand. I like gig bags because they allow you to carry most of that stuff on your shoulder, leaving you at least one hand free, but they're not protective enough. So the SafeCase is kinda the best of both worlds: the safety of a hard-case shell and the comfort of a gig bag.
Why four stars, then? Because it feels like the pockets could've been engineered a bit better. The front pocket (the one in the headstock area) feels useless: I can't put a tuner in there; the hex screw would fall to the bottom of the pocket, making it impossible to take it out of there; it's too tight for big gadgets and too deep for smaller ones. The front bag is of the right height.
Still, its internal division leaves something to be desired: my tablet (Samsung S8+) doesn't fit inside the tablet compartment, forcing me to put other stuff in there and leave it in the main compartment; my Air Turn tightly fits inside the bag, so much so that I have the feeling there's a bit of pressure on the footswitches.
I haven't used the isothermal storage bag yet.
Still, I would've liked other options for tying other gadgets (like my music stand case, an umbrella or something useful that I don't necessarily need to carry by hand during commutes).
Overall, it's an 8.5/9 out of 10, as it can still be improved, but it's a great option nonetheless.