Interesting to find these comments, a bit like going full circle, having used U/M and M/S for about 10 years.
The original U/M was a bit abrasive and wore out jets, but was modified, another point worth noting, is that U/M was a Woolsafe product and obviously is still a Safe on Wool product, the only difference being, the W/S organisation charge ludicrously high fees to stay on their list and the Saunders bros' decided the fees were unjustifiably high,