My Norelco Arcitec shaver is by far the best electric shaver I've ever used, but I have been somewhat disappointed by both of the replacement heads I've purchased over the last year or so. For whatever reason, the replacement heads just do not work as well as the original heads that came with the shaver. I was thrilled to have found a shaver that could actually cut the hairs on my neck quickly and thoroughly, but now I am forced to go over those more troublesome neck hairs time and again, from different angles, to try and get those sorry buggers clipped. Shaving my face is less problematic, but I must say I got a closer shave with the original heads. Now that I've had the same experience with two replacement heads, I can't help thinking that either something has changed in terms of the manufacturing process of the razor heads or Philips Norelco just puts better quality heads in the original shavers. I'm still an Arcitec fan and will continue using this shaver - and these replacement heads - for the foreseeable future, but my love affair with my Arcitec shaver lacks the passion it once had.