I was interested in that frame at one time, so I followed most of the threads about it. I even held one up close and looked at it at my LHS. Never did get one for a variety of reasons. Some of the problems below I saw when I looked at it. Others that actually bought the frame noted some of the following problems:
*Heavy enough that even AEK and lipo's with brushed motors wasn't enough.
*Had to go brushless motors and lipo's to get enough power.
*Got radio glitches that wouldn't go away.
*Servo mounting was a problem.
*Canopy mounting was a problem since they don't provide any mounts.
*Battery mounting was a problem since they don't really provide an actual mount.
*Servo pushrods to swash are not 90* to the swash, which introduces unwanted interactions with the ccpm movement.
*I think there was a problem with the motor pinion clearance hitting the frame.
*People seemed to agree it was designed more for the Hummingbird CP2 than the EFlite BladeCP. Those that put the frame on their BCP had more problems with servo mounting, motor pinion clearance and motor shaft lengths than those who put the frame onto a CP2.
*It costs $70!
Those people that started with a CP2, converted to full separates (no 4in1, separate BL motors and BL ESC's, separate gyro, etc.) and used 3s lipo's seemed to have the best luck. Those that got the right combination that didn't glitch liked the durability of the metal frame and power of the BL motors. Others that had unfixable glitches and brushed motors, eventually went back to the stock frame.
I would have liked the extra strength of the aluminum frame, but I wasn't willing to put up with the other problems people encountered. So I'm still using the stock BCP frame. Once your skill level increases to the point where you're not crashing all the time, the stock frame works fine. It's plenty strong enough to withstand flight stresses, just has rather weak rear landing skid mounts if you crash.
To beef up those weak rear skid mounts, try wrapping multiple figure-8 loops of unwaxed dental floss around them, then soak it thoroughly with thin CA. That should strengthen them up a lot more and adds very little weight. Ideally, this is best done when you change frames, so the servos are out of the way. Otherwise it's too easy to accidently glue the servos onto the frame.