Anyone thinking of getting one of these I would recommend the Silverline 4 piece set. Don't buy two or three piece sets as some do not include a 10mm box spanner which you will need for many of the continental makes of taps.
The Rotten Burger ones don't have a 10mm socket, which I find odd seeing that it was originally a German company but the German manufacturers seem to like 10mm nuts on their monoblocs!