those 4 bladed ones work well enough if you're planning on shaving every day, but i can't be assed to do that. for a two week beard i would have needed to use a single blade bic shaver first, to get rid of most of the hair, because the 3 or 4 bladed ones get clogged up. i only use those for the finishing extra smooth pass.
i've got a little phillips electric razor with a bunch of attachments that i use for shaving and cutting my hair, works great. skin feels like sandpaper, but eh.