Nice but pricey. I catch them when they are on sale for 30% off from Toollady.
There are several variations of the slotted precision drivers... I think there are 2 tip styles and at least 4 if not more handle variations. I think my favorite is the santoprene handle with the hollow grind.
Wera and Wiha are wedge shaped with flat grinds. PB Swiss has parallel tips with their unique Swiss grind (don't know what to call it) or a hollow grind.
Here's a summary that might help keep things straight...
Wera --black flat ground tips
Wiha --hard chrome flat ground tips
PB Swiss style 1 --black unique Swiss ground parallel tip
PB Swiss style 2 --black hollow ground parallel tip
Here's a photo of Wera, Wiha and PB Swiss side-by-side.
top to bottom: Wiha, Wera, PB Swiss
And here's a comparison of the tips.
left to right: PB Swiss unique Swiss grind, PB Swiss hollow grind, Wera flat grind, Wiha flat grind