The Pilot Hi-Tec-C Cavalier is the "professional" looking Hi-Tec-C model. The pen tip and performance are the same as in the regular Hi-Tec-C model (excellent of course), but the barrel is a huge upgrade from the basic plastic. It is 100% percent metal from tip to cap, and therefore has a nice weight to it. The diameter is a bit smaller than the regular Hi-Tec-C models, so I did find it a bit tiring to write with in long stretches, but it is so good looking and performs so well I didn't mind too much. All in all, this is a great option if you are looking for a bit of a style upgrade from the standard plastic barrel.
One thing to note: The Cavalier model only takes Cavalier refills, which come in black, blue, and red. So, if you are hoping to pop your Mandarin Orange or Soda Blue ink cartridge in this barrel, you are out of luck.