I took all my angle grinders out for a spin the other day - I was primarily interested in the smoothness - The only failure I've ever had was the switch on the thumb-switch variety--
The Milwalkee 4.5 (it wasn't snap-on it turns out) - and the Hilti 4.5 seemed the same as the PA 4.5" fixed speed. the next was the PA 5" rat tail, then the Metabo 4.5".
Surprisingly, the next jump up in smooth was the 4.5" variable speed PA.
Then another jump up for smooth in the large B&D. The Dewalt was next, and the smoothest was the Hitachi (now Metabo HPT).
@David_R8 Whjen you get a chance, can you try to describe how it feels to use it? Did you manage to find it on sale?