I'm in the Marines and shave my head once a week. I've been using these for over 5 years. I use a 00000 blade and not once have I nicked my head. Gets extremely close, and I can trust it. I just use it on myself and once in a while I cut friends hair, but I've never had a problem with these and continue to use them every week... Definitely recommended.
ProsGreat quality, quiet, don't get hot, interchangeable blades, simple to use.
ConsA little bulky and heavy with a heavy duty cord, not really a negative. Takes a little getting used to if your cutting your own hair.