Review (5/5): Great value
I've had one for the last four years, and it works great. Over the years everybody in the family got this model or the rechargeable one, and we all love it. Yes, the heads are expensive and hard to find, but I got a whole bunch and am hoarding them :).
I much prefer the battery powered ones to the electric. The batteries last quite long--3-4 months for me. And it can be put away in a drawer, instead of adding to the clutter on the counter. And I'm not paying a premium up-front for a rechargeable battery that itself needs to be replaced in 2 years!