they are overrated, but only to a certain degree... I would much rather run an ems over the others though b/c most of them have many more flaws as apposed to an ems, I know I've seen more ecu upgrades screw up b4 an ems, assuming both are set up properly... but i'm not taking sides either b/c i agree to disagree, because one is also fifty million times cheaper to get than the other. Each has it's pros and cons, and i'm not even gonna say one outweighs the other...