They're not bad, but they're not really that good either.
A tad short compared to Joe figs. If your average Joe is 6' (1/18), these guys are about 5' 5".
Weapons(specifically the M4) are too big for the fig's scale, and not very well detailed.
While some may like the "ball-swivel" knee joint, it limits the range of motion for posing. It does give the lower leg the ability to swivel (sit with one leg across other knee), but a leg swivel feature should really be in the hip/upper thigh to keep the double-jointed knees.
Arms are ok, but again the range of motion is limited at the elbow (we're used to that by now).
Helmet seems ok, but may be a bit small for a Joe head.
Vest isn't too bad, but the pouches lack any true detail.
All in all, a good line if you leave them by themselves imo.
The best part(s) of these figs are the removeable elbow/knee pads, and the textured baseplate/stand - which I just used on my latest custom "Delta Operator". The pads work rather well actually, although I'm sure it depends on what fig you're using them on. On my Delta, they fit just right. Not too tight, not too loose. Pic for reference -