Bill- I've haven't tried soft shell pants like you've mentioned, might have to
for three season I spend 90%+ hiking in shorts, if it gets really cold I don a light fleece pant (Patagonia R1's ~ 8 oz), heavy rain- rain pants
I often hike in areas (or times of year) where rain is a low likelihood or if it does it's of short duration- it's those area/times that I think I'll ditch my rain gear and rely instead on my Houdini and "houdini-like" pants :)
I found a similar thread dated a couple of years back- in that thread someone gave the ID pertex pants a go and said they were horrible
evidently lots of folks had the Houdini pants back then, which nary a bad word was uttered- of course they have long since been discontinued (which is too bad)
that same thread the general consensus appeared to be that the montane featherlites were more breathable than the MB offerings, but less water resistant and a little less wind resistant (makes sense)
now if someone happened to have some Houdini pants collecting dust in their closet………. :)