110 Volt Model isn't as good as the 220V model [SEP] I purchased a 220 Volt model overseas and like that one very well.  This led me to purchase the 110 Volt model for use in the USA.  The action of the 110V model is very sluggish compared to the overseas purchase.  I would not re-purchase this one again, but I won't quit using it either.  Price for refills of the head is pretty pricey not to be completely satisfied.