I have been using the M5 for awhile now and just love this razor, nothing cuts closer! However, my only contention is the darn trimming blade. After accidently slicing my dome on more than one occasion, I started thinking, and thats when I examined the cartridge closely and found out that it can be diassembled quite easily. I then figured out how to remove the trimming blade and reassemble the cartridge. Voila, no more unwanted dings in the dome, and still getting that sweet shave, problem solved.