Running an IMS 4 gal tank. No leaks or problems other than discoloration from the fuel over the years. It was white but is kinda tan now. it has been on the bike for over 10 years. I did have to replace the gas cap because the rubber gasket/vent ripped this year and I could not find just the gasket. I think that $12 in over a decade is pretty good.
If I replace it I will go back with an IMS. I just cheap and don't want to spend the $$$.