I have a set of Bender ported 600 SRX cylinders.. All I can say is wow!! If you think these guys can't do good porting you should have a look at my cylinders. The work is second to non! 128 mph in 2000 ft with a 600, I think the performance is there too!! I have a set of Mr. Viper 780 cylinders aswell, the porting work on these is a bit rough in comparison, it runs good though. As far as Iantomassi's work, I'm not saying it's bad because it's not!! They do good work. Just think there's a little bullshit flying around this post!!! $455.00 for a porting job!! Good luck beating the value you are going to get out of this. It's a Great deal. You can barely get a set of reeds for that price!!