The springs are strong, which makes them a little difficult to place but once it's done the pickup is held firmly for ever, and adjustment is smooth and positive. The wires are on the thin side but tough nonetheless, and soldering was quick and trouble-free. Coupled with copper foil shielding and an extra ground wire from the pickup cavity to the pots cavity, hum is very low.
Now the tone: like the Telecaster neck pickups that I already have from Fender and Duncan, this one has both the heavy and shimmering virtues, and takes strong distortion very well. It is a simple and worthy change to my Tele clone that had a nice-souding but not hum-free neck pickup. The clarity from the top brand pickup maker is also an audible bonus.
By the way, the humbucker bridge pickup on the clone is even quieter than the Di Marzio, and its sound is very, very pretty and full. So don't rush to change all the pickups on your clones just because they are not top brand, listen carefully with an open mind and you might find a "cheap" stock pickup doesn't necessarily have to be replaced.
Edit: the Duncan sounds the softer, the Fender from the Gen 4 set is a little hotter, and the Di Marzio is hotter still, very much on the hard rock territory.