I have been usingMothers 07240 California Gold Clay Bar Systemon my car for a number of years, but only recently tried Griot's Garage Clay kit for the first time.  Overall, Griot's Garage did the job, but I liked working with it less than I like working with Mother's clay.  I will explain the differences below.I am attaching a collage of two photos under customer photos.1) The stock photo is somewhat deceiving as it makes you think the clay fills the nice container it is shipped in. Photo #1 shows the clay in the plastic wrap is it arrived. The amount of clay is sufficient to work with, I am not complaining about that, just the photo makes you think you get a lot more. The container itself is very nice for storage. Mother's clay does not come with a container and I had to come up with a plastic container of my own. A tip on storage: before storing the clay ball in the container wet the outside of the clay ball with Griot's Speed Shine or any other detailing spray. This makes the clay easier to take out the next time as it sticks less to the container.2) Photos #2 shows the 35 oz of Speed Shine which came in this kit. Speed shine has almost no scent, provides good cleaning and is easy to work with. Its spray trigger (included  in this kit) delivers a generous even spray of liquid. Because it is a generous spray the solution is used fairly fast. On the first application of clay I used 1/4 of the bottle. I think I will be able to get 4-5 washes out of this bottle.The clay worked well to remove debris. It took more swipes to remove debris with Griot's clay than with Mother's Clay, but the results were very good. The clay itself is softer and fairly sticky and my hands were slightly yellow when I finished, and there was clay under my nails.  This does not happen when I work with Mother's Clay system.  I was able to remove the residue from my hands using Griot's Speed Shine followed by a vigorous washing with soap.  This made working with the clay less enjoyable.  For example, when the phone rang while I was cleaning my car I could not pick it up because I had clay all over my hands.A tip for short people: I am fairly short so reaching the middle of the roof of my Honda CRV to clay it is difficult. I found that that I can do it if put the clay ball under a triangle-shaped Windshield Reach and Clean ToolStoner 95161 Glass Reach and Clean Tooland use it to rub the clay ball on the parts of the roof I can not reach.  The reason why it works better than other tools is because its surface is concave to follow the windshield shape and that curve holds the clay ball without the ball sliding out.Ali Julia review