they are pathetic, anyone who relies on them for a check on a car is seriously kidding themselves, if they think its going to come up "clean". If you have an import, sit down, get a coffee and wait for the pages and pages of things that are "wrong" with your car to come up. They are for road side assistance and checking over nanna's corolla, if that. If anyone wants to take an import there then you should burn $170 its more exciting!! Not to mention the things they check probably wont be what your worried about going wrong in a performance car anyway. If you do a search there are a million threads about them on here...nyway
thats my 2c others are welcome to disagree