I'm not Slay, but I got my order in the other day. So far, so good with them. The accessories stay in for the most part, outside of the armored shoulder pads; those things would definitely need to be glued, but I'm not really a big fan of them anyway, so no loss there. I also had some issues with a couple of the mounting bracket accessories for the helmets due to some flash on the backside. I'm sure if I sand it down, they'll fit fine.
The modular accessories for the vests are pretty secure for the most part, though with enough fiddling they'll probably pop out unless glued. Haven't had one fall off yet though. swapping legs is a breeze because of the torso balljoint, I really wish this is how the 25th and on Joes were constructed, they're able to retain the same level of articulation but without breaking up the sculpt. Kind of the best of both worlds between an O Ring and the 25th construction. I was also surprised with the shin guards, the plastic on the part that covers the foot is fairly flexible, so there's not a lot of rang of motion lost there. Only thing I've noticed is the elbow joints seem less tight than a Joe, but they hold poses without any issue.
Honestly, the're pretty great figs, and they're at least on par with Hasbro's offerings if not better. Oh, and the heads are interchangeable with Joes, so that's a bonus. I'd post some pics, but I'm at work and all.