I write very few reviews on websites, but thought it appropriate to write a review on PRI-G.  I cannot speak to the other products they make, but if they work as well as PRI-G then I will use them as well.  I purchased a 16 oz. bottle nearly a year ago I guess because I had read so many positive reviews.  Well, specifically I had read that one guy could not get his lawnmower started due to old gas and possibly some gumming up of the carb.  Well, in my case I had an old generator that I use out in the back field where my horse stayed.  The generator did not get much use as is with many generators for most of us folks.  However, when I read that someone was able to get an old lawnmower started with this stuff I just had to give it a try.  I mean the last thing I have time to fiddle with is pulling apart a generator to clean the carb out.  I should also preface this review with the explanation that I had tried on and off for several months to get the generator started but to no avail.  I read the instructions that were included, as well as those which were on the bottle, and then used one of the medicine applicators that you use when your kids are sick (Hopefully my wife did not notice it missing).  After squirting a very small amount into the gas tank I placed the choke to full and pulled the starter cord about 10-15 times until I could smell gas.  I then walked back up to the house and waited an hour before heading back out to see if it had made any difference.  After arriving back I repeated the same steps as I had many times before but without a positive yield.  On the 3rd. or 4th pull she started right up with no hesitation and ran flawlessly for an hour until I shut her down.  I have since used this on another occasion to get the same generator working that I had not treated the next batch of gas, and once again she started up after waiting 15 minutes from treating the gas.  I now use this in all our engines that are not used on a regular basis and have told my co workers how impressed I was with the product.  I will agree that its a bit expensive, but if she can get an engine back running without you having to drain old gas, or work on a carb that's sat to long then for me its well worth the price.  Before you take things apart, or worse take it to a shop and pay big bucks to have someone work on something that's been sitting awhile.. try PRI-G first!