I've used the 4 blade in 90 and 100 gr for years. Just switched to the 3 blade 75 gr bh this year 'cause I couldn't find a 4 blade that light. Haven't tried the MX as I can't justify the cost. (Tried the Slick Trick last year, it is similar to the MX, and it performed no better than the Muzzy. Shot different deer with both heads. Actually thought the Muzzy flew better.)