Its pretty annoying when you're in traffic and can shift into the gear you want... You have to stop and think, WTF, them remember the stupid CAGS and settle for 4th and lug the engine.
Its only purpose is to influence EPA mileage estimates for the car.
Do a search on EBay... you can usually find them for around $12 shipped. Installation is simple, buy search the DIY forum to see where the solenoid is and make sure you don't installed it on the reverse lockout by mistake (same type connector).
Example:
http://cgi.ebay.com/ebaymotors/CAMAR...item3369dda8e5
PS - The resistor only option will work but you won't have the water seals, so you'll eventually have problems when it gets wet. Its well worth the $12 for the water tight connectors - one on the solenoid and one one the wiring harness.