I've run a LOT of Sirio engines and find them to be exceptional in most cases. I think what most people are objecting to is the title of the post. It's not very reasonable to suggest that nobody should but a Sirio engine just because you had a problem with one part on one engine. It might be more well received in the future if you just state the nature of the problem in the title, like "broke the crank on my Sirio engine." At which point some of the members might tell you that it sucks, but it happens sometimes when you suck a pebble through the gears. It's probably the fastest TC engine you can buy, so, work it out with the crank and put it back in your car. I agree that your experience would have been better without the broken crank, but you're throwing the baby out with the bath water.