Unappealing to me. They work ok but to me are inferior to composites in weight, price, grip, thermal conductivity, etc... I live in Wisconsin which means 8 months of winter a year. I don't like having cold metal in my pockets or my hands.
I think titanium has a "cool factor" for a lot of people. One of those things that I don't understand aesthetically, like damascus steel, acid wash finishes, overuse of the word "patina", and chunky "tactical" designs. Oh well.
Current folders: Chaparral FRN, Native 5 Salt SE, Native 5 Maxamet, Native 5 S90V, Stretch 2 V-Toku2, Endura ZDP-189, Native Chief S30V, Manix XL M4, Police 4 HAP-40. Police 4 K390 LW
Current fixed blades: Jumpmaster 2, Street Beat FRN