I had always used regular furniture cleaning agents on my guitars but these dedicated kits specifically formulated for the job are much better. In fact, I was surprised at the transformation as each of my guitars was bought back to it's original colour and shine. My only criticism is that the bottles are quite small (2 fl oz) so won't last very long, especially if you have six guitars like me.
I found only advantages, cant anything bad about it. Cleans very well, helps to maintain the instrument, but some of the cleaners are useful, to be honest. Moreover , if you order it from overseas it is better to buy the bigger package, because the small one wont last for a long time.
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