Seafoam for cleaning fuel system?

Does anybody know about this stuff called SeaFoam that is used to clean fuel injectors/fuel system and crankcase?
 
Is this a good product and safe to use?
 
Thanks,
Dave

yes this is good stuff beings 1 its a patrolium product so its engine savy and 2 it does clean but heres the deal when it cleans out your injectors it tends to clog your map sencer which is a easy fix cause all you do is take the map sencer out and spray it with carb cleaner also I like the tranny stuff ,cant remember the name

where is the map sensor, if I need to clean it out?