Seafoam engine cleaner.

Has any one recently used it before and does it work? I've been working on engines a long time and I've never heard of this stuff. I've read threads on this and I'm a little sceptical about running it through my engine. My 4.3 has almost 200,000 miles on it and runs great. I've been religious about changing the oil and filter about every 2000 miles. My question is, will this improve my performance and will it have any ill effect on my engine with the miles on it that I have. Any feed back will be greatly appreciated.

Save you money and buy a bottle of engine flush and use it for 30 minutes at idle before you next oil change.