Review (2/5): Extremely poor engineering
The good news: Small, light, easy to handle, decent shave, Very easy to clean, cutter life. The bad news>>It runs off a single 1.3 v AA (penlight) nicad cell [cheap, cheap!), which unlike previous Norelco models, dies very, very young. It is not replaceable. This is inexcusable for a $125 razor! I got about 14 months before it stopped and I had to throw it out. I have never had a battery failure on a razor before! Other models use multiple cells or larger capacity cells. It has a microprocessor chip in it (why so complex?!) so don't even think about de-soldering the bad battery and replacing it. It will not run on the AC cord alone.
I replaced the cutter head at 12 months, but found out my old head still cut at about 90% - 95% of the new one, so the cutters are durable. The bad news is that the razor I bought to replace this one costs a lot less than I paid for the cutting head! You have to buy one of the two top of the line Norelco models to get the good heads and that is always $100+ for the razor and $40+ for the heads. After 30 years of Phillips/Norelcos, no more Norelcos for me.