I personally dont use them, used to ALOT when working in pharmacy( and every second person comes and breathes on you then says "I have the worst gastro/flu/cold etc)
For you guys with small kiddies, please be aware of the safety issues associated with things like the dettol waterless and aquim hand sanitisers, they are 99% alcohol and could be nasty if swallowed by babies/toddlers, also HIGHLY flammable.