Yes.  No chip ever really helps, or any other wonder mod for that matter.  Think of it like this, if the chip is really that good, wouldn't the manufacturer have put it or something like it on the car originally?  In a very competetive market like this where effiency and hp(now anyways)  are the key to selling their products, the manufacturer would try and squeeze every bit of performance from an engine before they sold it.  So why not "chip" it before they sell it? 

There was a test done on the venom chip that made an astounding discovery.  The chip claimed increase hp and torque by about 20% except at full throttle.  Well, it did.  However, it did it in a very sneaky and undermining way.  Instead of "optimizing" the engine's fuel maps or what not, it simply intercepted to throttle signal and modified it.  So if you push down on the gas pedal about 50%, The "chip" tells the ecu that you're pushing down 70%.  When you press down to 80% the ecu thinks your at full throttle, so anything above that won't even matter to the ecu.  So they weren't lying....but they didn't really help your car any more than you could by mashing the pedal a little more.  I doubt the jet chip is any different.