We bought the both Stage 2, intake and exhaust cams not really knowing if it would make a difference. We thought we had spun a gear on the stock cams, so we decided to replace them with the upgrade while doing so. I was skeptical after reading some of the reviews but did it anyway cause I've learned you can't please everyone. They were simple to install. Some Kx250f's require grinding a smidge of the head, but luckily ours didn't. Our bike has the 263cc big bore kit and these cams really brought it to life. Anyone complaining about loss of torque or power has obviously set the timing wrong or didn't shim the valves after installing. Didn't lose any low end but gained a lot of mid-high end torque. I would highly recommend giving the stage 2 cams a try if you're looking for upgrades to your already beast of a bike, The Kx250f.
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It really gave my 07 YZ250F big bore kit a added boost. I's awesome and much easier racing than my 450.
I installed the stage 2 intake and exhaust cams along with the Cylinder Works big bore kit in my 2006 YZ 450... this bike is back from the dead! enormous power and two stroke like throttle response. I highly recommend their products.