hi, welcome to the forums.
what state do you live in? even though they are considered an 'assisted opener', you want to be careful about carrying one if switchblades are illegal in your state. regardless of what people say here regarding their legality, it's possible that if you're caught with one you may have to go to court facing misdermeanor charges to find out what the court thinks about your knife. chances are that will never happen, but be sure to understand what your local knife laws are, and that depending on where you live, it's possible you could be hassled for carrying such a knife.
now that's out of the way, the buck rush is probably a decent knife, i fooled around with one once. if you're interested in assisted openers, other knives to check out are kershaw onion's, camilius HEAT, and the more expensive benchmade apparition. the crkt m-16 also is a cool knife that can be flipped open with a flipper. i like it because it flips open without needing a spring, making less likely to draw attention from the law, plus it's fun to play with. Also, check out benchmade AXIS lock knives, a popular inexpensive one is the griptilian and mini-griptilian. of all the quick opening knife types, the axis locks are probably my favorites.