We love them? Yes! Are they the right bike for what we are doing ? No. We stop using the 4 stroke bikes this year. Our tracks tend to be more demanding every year and riders always prefer the 2 stroke bikes. Every time we put a 4 stroke to the test, its rare to find a capable rider to handle it and use its technical benefits tin our tracks. If used the wrong way, they boil, they run out of juice, they feel are heavy, and they need an XL rider to be tamed (Not to mention super experienced and with huge guts). Who knows, sometime in the future, maybe we see them again.