Begging to differ, as I own or have previously owned several models of Magnum, Saito, YS, thunder tiger, Enya four bangers. My opinion, and that's all that really matters to me anyway, is that the OS offers the most reliable, trouble-free performance of all. Are they as powerful as YS, no, are they easier and more long lived then YS? Yes. I think you have to be a real tinker nut to operate YS, and I do own 6 of these. OS is straight out of the box and flying perfection. Magnums are OK but deliver at least 20% less power then the OS counterparts. Saito has a long break-in period and tend to have a bit less power then OS as well. RARE BEAR, probably an OS 120. i'VE SEEN THIS SHIP LIVE AND IT DOESN'T SEEM TO BE WORTH MORE THAN $200 TO 250 COMPARED TO OTHER SHIPS OUT THERE. No retracts included.