the SME I trialled was one of the first on the market, and its performance was not top tier for the great uneducated & specification oriented on this thread. I dare say the improvements wrought by the changes to later production must have been significant.
I just read a 6moons review which sums up my views in a nutshell
For me this arm is two chopsticks short of a noodle. It’s an ox and it plods