Personally I think most chips are a waste of money, at least for a tacoma. When you have a factory turbo car like a VW 1.8T then a chip can do things like raise the turbo boost and increase the fuel, which obviously will make more power.
All a chip can do for a taco is advance the ignition timing and play with the fuel maps. Doing this will result in little or no gain on a stock or modified tacoma. If your tacoma is modified enough to require more fuel than getting an adjustable fuel pressure regulator to increase the fuel is the best idea.
I challenge anyone to produce dyno charts showing a before and after horsepower gain from a chip on a tacoma. Any dyno charts from a company selling a chip are NOT valid, regardless of what they promise you. A car "feeling" faster is not enough proof to justify the purchase of a chip. The $400 someone would spend on a chip would be better off going towards an exhuast, headers, etc.
All of these things I am talking about are from experience watching countless cars dynoed at my friends shop JG/Edelbrock (formerly JG engine dynamics in Alhambra, CA). I have spent years hanging out there and all I am trying to do is save some people from spending their hard earned money on a part that is NOT worth the money.
Glenn
Glenn's Honda Civic Performance Page
http://home.earthlink.net/~akuma/cars.htm