Have only used the 10mm, 12mm, and 14mm so far, but they have stood up to some high torque impact abuse so far. Specifically for my job I needed a 14mm semi-deep (not shallow, not full deep) swivel. These fit the bill just fine and for the cost of 2 snap-on equivalent sockets I get a whole set. Stuck my impact (that's rated at 1100 ft-lbs) on and hammered away. Held up great. No major signs of wear. 6 point means they didn't round a single nut.
Rating:
[5 of 5 Stars!]