Easy installation, stable and very comfortable

I bought this height-adjustable armrests for swivel chair called "TOPSTAR 48610 G26 swivel chair Point 80 Express 06-10". First is to say to the armrests, that here the first product image from Amazon flawed and therefore misleading (as of 10/2010). The first product picture shows namely armrests that are adjustable in height * not *. So the picture is one of a completely different product. Fortunately, shows the second product image (the image without chair) the correct (height adjustable) armrest.
The armrests were delivered well packed within one day from Amazon. The installation was done thanks to the included instructions in less than 10 minutes. Not even a tool is needed for it because accompany two appropriate screwdrivers. The only thing you can complain to the assembly instructions, is the fact that two of the attached parts are not listed therein, namely two washers. But this is not so bad, because it immediately opens up without instruction, where the belong.
The rounded shape of the armrests on the arms are very convenient, even if you are seated sits down on the edge of the chair and resting only the elbows forward. The round shape no edges can be felt.
The only thing I find a bit negative is the fact that the plastic tops of the armrests (ie the plastic part, which is adjustable in height) shakes a little when you press against the sides. While the metal part below budge, but the plastic top has a play of approximately half a centimeter in both directions sideways, stating also sounds. If you rest your arms, but do not occur noise and is therefore not acceptable.