Some people say the Vikan Easy Shine kit is terrible.
But I disagree, I have one and I believe it is a useful tool to have.
I use it for inside awkward to reach windows and it makes life a lot easier.
I have an office I clean outside fortnightly and inside every 4 weeks, and there are a couple of inside windows that are very awkward to reach due to a photocopier being in the way and another (a large window) with a large desk right in front.
The Vikan is perfect in this situation, the windows are never filthy and the Easy Shine cleans them to a decent standard that I and the paying customer are happy with.
All the other windows are cleaned with a mop and squeegee.
So im not saying I would use it for all inside window cleaning but for the odd couple of awkward windows I am happy with it.