The Good: Usable traction combined with good rolling speed and durability, and less than half the cost of most other tires
The Bad: Doesn't have the cornering ability to be used as a dependable front tire
If you're on a budget and you need to keep your bike rolling, the Panaracer Fire tire is a surprisingly decent option as a rear tire. No, it won't work quite as well as more expensive, refined tires, but if you're not racing and you just need to hit the trails without breaking the bank, it will do the job.
While it doesn't have the cornering blocks necessary to hold its own as a front tire, it's fine when used in the back. It's a little narrow for aggressive all-mountain riding, but for riders who frequent fast singletrack more than big drops and rocky chutes, it works okay. Not spectacular, but well enough that you won't have to think about it. It rolls fairly well, has enough bite for braking, and isn't prone to flats. It sheds mud pretty well, too.
If you're strapped for cash, the Fire is a useful tire that can keep you out on the trails instead of sitting at home waiting for your next paycheck. Riders on a tight budget shouldn't overlook this tire.