I bought mine a few years ago and they have been my workbench wrenches ever since. Great tools.
The only improvement I suggest to any owners (and to Silca) is painting the recessed rubber bit. It is more or less impossible to read without doing so. I painted mine with white model paint (gloss enamel) so that it is easy to know which size wrench I'm reaching for (see photo).
If you do go down the road of painting I strongly suggest using disposable microapplicators. They will help get the paint into the recesses and allow you to sop up any extra that feathers out. Also, it does require a bit of touch-up from time to time (see, for example, the upper part of the two in the 2.5 in the photo). Thankfully, the 7.4 mL paint pot should last about as long as these tools -- a lifetime!