hi i love it, it has alot of useful info.
and
re-setting the code's is a plus.
also it has the X guage which i use for engine/flywheel horse power.
like it was already mentioned, it can help you save gas.
infom you of many thing's going on, such as intake air temp,
antifreeze temp, closed loop open loop, rpm's, speed,etc.
what i would do is 3 thing's
look at
ebay, they have alot of info on the product,
look at there web site,
& finally read what has been posted here.
the only issue we are all waiting for is the tranny temp. it doesn't have it
make sure you buy the 3.15 version with the X-guage.
good luck,
gorilla