I recently switched to the Solas dual impeller for my 300 RXTX because I had two previous dual impellers have spline stripouts over the prior two years, I don't have enough time with it to see if it lasts but have noted the performance is equal, also the solas is half the cost and is much easier to install and even comes with a shaft tool for free.

Check out the spline stripout I had on the skattrak, only earlier post, well the exact same issue happened again for me two weeks ago.