the ratchet is model 512QR N ,is 60 fine teeth quick release here in italy is in promo with 44 € vat excluded ,no i have not use yet,i buy it yesterday ,but i can tell you that the movement is very precise and the teeth movement is a bit stiff and rubber on the handle gets slippery very quickly in contact with oil,and yes the ratchet is not very smoother ,for socket i can tell you that are verry acurate i measure for example 13mm with calipper and is 13,08 or 22 measure is 22,06 all the socket are verry acurate.For the quick release sistem i can tell you are very nise this lock the socket very strong on the ratchet.
Another thing the green button for lock unlock on the ratchet seem to be same kind of plastic ,but on the extension al the button are made from metal.