I've been using the Remington DA307 rechargeable for years. I get a bit of rash using a blade on my upper lip and chin, basically the whole goatee area, giving me a clue as to why some men wear a goatee. I carry the 307 in my car so I can shave while driving. Sound tells you when you're cutting and not. The pop up sideburn trimmer is more useful for getting the long hairs that escape the foil cutter. If I use it everyday, I can stay ahead of needing a blade, but a few hairs will escape and get long, at which point the foil part usually won't get them. If I miss a day or two, the only real solution is to use a blade and get back to square one, and then go with the electric as long as I can.
For awhile, I could buy them new on ebay for about $25, which is about what new foils cost. The sideburn trimmer gets dull a bit too quickly and there is no replacement blade for that, so buying a new or reconditioned unit is a good way to go. Re-cons are about $25 now with shipping.
Science advances one funeral at a time. - Max Planck