These are great mechanical pencils. Very well made, very nice balance. This is my second Rapid Pro as I wanted one for my workbench. Nice weight with a knurled grip means it doesn't slip in your fingers.
The pencil is superb. Have tried a lot of similar pencils, including Rotring 600, Pentel Graphgear 1000/500, Pentel Sharp Kerry, Uni Kuru Toga Roulette and more - this is my current favorit.
It is solid and gives a good feel, without being to heavy for longtime writing. The grip is perfect, and I prefer it to the thinner Rotring 600 grip. The retractable tip is not the most intuitive patent, but it works well and does the jobb without any fuss. The pen is stable and doesn't feel wobly, as some users complain about in the Rotring 800.