Engines are just plain neat in their own right. Some guys like to buy and run engines simply to run them, and then sell them to buy something else (like me) or stash em' away for "later".
I too have owned too many engines to remember. I love to run engines!
I would put my Jett .46 up against any of the modern day "sport" performance engines anytime, anywhere. Not including the non-throttled 40 size rear exhaust piped engines, I am comparing apples to apples here (muffled side exhaust). Yes, they are more money than an OS, or TT, etc but thats what they are so buy one or buy 2 of something else.
I think there are many great engines in today's marketplace that are great performers. The Webra 50 comes to mind, the YS 45 is a good engine too. Why piss on one or the other because it can run 200 rpm faster?

Buy one of each!
One thing about the Jetts however, allthough they make great power, they also throttle exceptionally well and hand start (one flip - honest!) easily, idle super low too. All around best engine I have in the 40 class...
I second the PIco/Skyward 40 engine also as being a great buy. Its a bit heavier built than some, but they also make good power and handle well.
Maxtenet, are you a meca member? I am, # 4651. I joined mainly because of my love for antique sparkers and I used to have a huge vintage 1/2A collection (sold it off to pay off student loans last year) but I enjoy being part of the group.
Andrew Coholic