The L keys I had great success with, they are durable and awesome looking (silver for sae, gold for metric).
The bits in sockets on the other hand are terrible. All the smaller ones keep falling out of the sockets. Seems the green ball that holds it in the socket was worn out before I even...
I do not use them every day. Most of this stuff is less than a year old. I am an engineer that does some mechanical work in an industrial environment. We have to supply our own tools at this place. I figured I can finally step up since it'll be a tax write off (hopefully).
Edit: I'm also am...
From left to right on the ernst magnetic rails
Item No. 1430MRD - 1/2'' Drive Standard & Deep Length Metric Set
http://www.gpsocket.com/index.cfm?event=setview&productsetid=22303&id=4576
Item No. 1328RD - 1/2'' Drive Standard & Deep Length Fractional Set...
Not as far as I know. Leads are the biggest weak link in the equation (wear and tear). I got it for the data logging features. It is bulky, that is a fact and the continuity buzzer is quiet. Can't hear it from under the hood while in the seat sort of quiet. But I trust it with my life...