I wasn't too fond of the Dark Source figures. They looked cool, but there were some major QC issues reported from various boards with parts breaking and paint chipping. I only experienced the paint issues. Plus they were short compared to Joes and Marauder figures.
But with their military line, there's huge improvement with the QC issues from the Dark Source line and the figures are now taller and more sized to Joe and Marauder figures. They now include replacement joints in case breakage does occur. I have the USMC, Airborne, and Mercenary sets and love them. They still have a few issues like the weapons and holsters being slightly oversized, and the 'diaper crotch' like the first Joe 25th figures, where the figure can't sit(wich could easily be fixed if you don't mind breaking out the exacto). They're definitely cheaper if you order direct from Locker Toys vs BBTS, Small Joes, etc.
Here's a review of the SWAT guy and he has reviews of other Joy Toy figures.
https://youtu.be/iFVmghWavcsAnother reviewer doing the USMC set
https://youtu.be/Zq4QL-bvVow