I've heard from several sources that the Pentel Tradio has a cult following, and I can see why. This pen has a variety of barrel colors, in both hard plastic and soft rubber. There are .5, .7, and 'fountain' (angled/chiseled felt), and ink comes in blue, red, and black. The ink is about as smooth and dark as it gets, as many will know from using the Pentel EnerGel line of pens.
There is an odd retro submarine window/bubble type thing in the cap, and I don't know what it does, but it looks cool. The clip is sturdy plastic, and seems like it will hang on pretty tight, but it is not very flexible, so it could break easily if over-exerted. The grip is a herringbone pattern and works pretty well, but it is not as good as the soft rubber of the regular EnerGels, in my opinion, because it is a hard plastic. The pen is, overall, pretty comfortable, and I think that if you like the characteristics that this pen offers, the $8.50 price tag (JetPens) is pretty agreeable. You should get a lot of solid writing out of this pen.