After reading on here I was gutted as id just purchased one of the 'stupid chain cleaning toys', however after now using it three times on my own steed and once on my mates I dont think they are bad at all.
I agree they can get messy and have to last more than a handful of uses to justify the cost but my general opinion is they are useful for those that a) have the dexterity/patience and
dont fancy dissasembling their chain just to clean it.
When it does brake or gets lost I will try the chain tool method as it helps to be experienced before jumping in I guess.