I played the demo yesterday and....yeah, i'd pay maybe $10 max for it if that. The gameplay was repetitive and generally not fun, the collision detection felt off, and the graphics felt to be about on level with Turok (thats not a good thing).
Alternatively:
1) sign up for one month of Gametap for 99 cents.
2) download & play Jericho.
3) download & play something good to help you forget about how bad Jericho is so you can get your 99 cents worth.