What started this for me was an AndroidCentral podcast a couple of weeks ago when the guys were discussing the best chargers for their cell phones. One guy from CrackBerry mentioned the BlackBerry Premium Charger which is a 1.8 Amp charger and everyone agreed that 1.8 to 2.1 Amps was a sweet spot for quick charging your cell phones.
I looked at the BlackBerry corporate site where they have a blurb on the Premium charger where they claim the charger is "designed to work with your BlackBerry smartphone charging twice as fast as standard BlackBerry chargers". I don't know if anyone has done any long term testing and if I had an HOX (HTC One X) which does not have a removable battery I might be a bit leery but since we can replace the battery if it begins to fail I will probably have one of these higher amperage chargers around for that time I forget to charge the phone and I need to charge it quickly.
If you don't want to do this and have no need (I am using my old BB Torch 9800 charger right now because I am too lazy to replace it in our charging station) then don't but I like having the option so I have one.
Mike