These are my initial observations.
4 mags to a box, and there appears to be a bit of a stain on the box. Upon opening up the box each mag had something on the square end of the mag wither it be lubricant or something else I don't know.
All four mags loaded ~170 BBs each the first time I loaded them, no silicone or other lubricant was added. They loaded just fine with my el cheapo BB loader, a bit harder as you moved around the first corner but not too bad. There were a few times when the BBs would double stack, miss one and then go back to double stacking. This happened maybe three times in one mag.
BBs can be seen from both sides there are no fake bullets in these mags, which IMHO is plus since you know how much of your mag is left. I left realism at the door since I am loading 170 BBs.
Test firing went very well, I used my CA P90 Proline and emptied 2 mags both semi and full auto with no problems, I was using G&G 0.2g BBs.
Initial reviews by others had questionable results. They could only load ~80 to start and had to really lube and break the springs in to load all 170. I did not have any issues.
So far I am very happy with these mags. As a side not these four mags hold the same number of BBs as ~10 TM mids would and at a fraction of the cost.
Holds 170 BBs
Easy to load
No feeding issues
None at this point