Hi mad german,
I prefer smaller folders for EDC also (e.g. Dragonfly, Manbug, Ladybug) due to working in an office environment and company policy. Personally, the PM2 is far too large for me to EDC. However, you may be just fine if you're already accustomed to the Delica and Lawman. The PM2 actually rides fairly low in the pocket too, which is nice. I tend to carry larger folders like this in my waistband vs. right front pocket mainly because it's uncomfortable to have the knife bunch up in my pocket when I sit down. Hope this helps.
As for accidental opening, I've never had an issue with a Compression Lock opening up without my knowing it. If it makes you feel better, though, just carry it tip-down and you'll be just fine.
"...as I said before, 'the edge is a wondrous thing', [but] in all of it's qualities, it is still a ghost." - sal