I've tried a few different high quality blades on my 250 CFX and these 245mm blades absolutely fly the best. You would think that longer blades might fly better but with a longer length the tail rotor has a much harder time holding steady.

I bought these blades knowing they were not recommended as replacement main blades for the E-flight Blade CP Pro but took a chance because they were a close match to the 515MM main rotor diameter. Upon arrival, these blades were 5/8" longer than the stock blades and about 1/8" narrower. The pivot bushing was the right diameter for the blade bolts and the reinforcement thickness fit the blade holders perfectly and would still miss contact with the tail rotors. I used a reloading scale to weigh the blades and both blades were within 1/2 of 1 grain of each other, almost perfect. (1lb= 7000 grains, should be accurate enough) I was trying to avoid disassembling the heli to balance the main rotor as an assembly. I added a tracking color stripe to each blade and weighed them again to get the same weight and mounted them in the blade holders.
I spun up the motor and lifted off, no noticeable vibration and the head speed seamed to be a little fasted than before. Blade tracking was perfect, no adjustments required. I only flew around doing hover maneuvers but was impressed because every time before when I changed main blades in anything, everything required tuning. These were the best out of the box blades I ever used and they fit the E-flight Blade CP Pro as well.

They seem to work great and look even better than the woods. Glad I waited cause they are a bit more money than the wood ones but they look and sound better than the woods.

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