I use them, have been for a couple of years. Weld collar onto strut, slide sleeve on, assemble strut, done.
Positive: Single spring seat with locking screw, rather than 2 seats binding on each other to lock the height.
Negative: None?
Not sure how they 'measure up' to the AJPS kit, but really any difference is going to be more so your spring and shock combo. They are a good quality item and I have no reason to change my mind about them.