From the perspective of a
Flex user...
I used Menz PG for a while, but couldn't take the heavy dusting. Further I didn't see any more cutting ability than SIP had.
I dislike using any Menz product with PFW. Gums up the wool and creates a mess.
I use Meg 105 instead with wool and for heavy cut applications.
Mez PG is no longer of much use to me at all.
SIP is a staple for cutting hard paints with anything but wool.
So in summary (at this time)...
Megs 105 and PFW for heavy cutting on both hard or soft paint.
For med to light cut SIP on hard paint with orange/white foam. Finishing with Menz 106FF.
For med cut
M105 and an orange pad. Light cut to finish with 3M Ultrafina SE with a white pad.
Still tweaking jeweling, but seem to be having good results with red pads using FF or UF SE.