I bought an orange 25m cable from the forum shop.
It also strikes me as being of good quality.
25m is quite heavy. I think 25m is worst case. I used a much shorter cable throughout the whole of last summer and there was only one occasion, Verona, when it wasn't long enough. As others have said, they use two shorter cables as required.
If you go to Europe you will need a converter to two pins, if you don't have one. These are still relatively common in Europe. I also used a polarity tester and a reverser cable on several occasions. Some don't think this is a problem, but I'm no electrician so don't really know.
I wouldn't bother buying a cable drum or Rollacord.
I understand some people prefer the blue cable, it's more flexible.
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