i have both, i started our last season in florida with the 353 and switched the end of year to the 12pt. for me both made 5 min. to me the 12pt has more bottom and midrange than the 353. On the tracks that i ran the 12pt i ran faster and more consistant lap times than with the 353. i have run almost 2 gal thru and no problems. I do not know anybody who had problems with the 12pt.