Mark we bought a couple shaker daughters from Mike in the mid to late 1990's and bought some semen from Shirley after Mike passed. Then we bought an Impact Shaker son that we used for about 8 years then sold to another breeder who used him for 2 or 3 years. Almost all of my cows go back to the impact shaker bull. He did a great job for us and his daughters and grand daughters really make nice cows. I still have 10 straws of semen from Impact Shaker. I have been saving it but should probably go ahead and use it. Mike was a great guy that was ahead of the curve when it came to breeding Shorthorns.