4:32 a.m. on December 18, 2012 (EST)
"Softshell" is the most underdetermined category of clothing, outdoor-wise. It could mean woven layers or glued layers, laminated membrane layers, or single layer...
Try them on and if they are not too restrictive, they will do you for any outdoor activity in the colder seasons, providing they are not the 'heaviest' type.
Marmot Scree pants are good value but I would put them at average for durability. There are some very durable fabrics, some even branded from the mill so you can recognise them, but I haven't yet got my head around what is what. IMO, the more elastic they put in the fabric, the less durable it seems to be. For instance, Patagonia use something that doesn't stretch very well and that has very little 'fluff' on the reverse, but which seems to last a long time. On the other hand, Marmot use something very stretchy in their jackets, with fluffy inner face, that starts to 'pill' within days! There is a thicker fabric by Schoeller (?) that seems durable but my version has a lot of fluff on the reverse and therefore I get too warm in anything above freezing, so hardly worn in the winters here (England). Mammut are popular in the UK and I have seen them in the shops and they look well-made.
[Edit: sorry, the amount of elastic in the weave probably has no bearing: I have an old Patagonia jkt that is very stretchy, with no brushed inner, and it has been quite durable - apart from the 'eco-glue', which doesn't seem to bond for long. Durability might be evident in how soft and light the fabric feels, i.e., the stiffer and tighter-woven fabrics are probably going to last longer.]
I find softshell trousers with light or heavy hardshell in the cold/rain/wind a better combination than thin baselayer with nylon trousers plus hardshell, in all but the coldest weather. I have worn a baselayer under softshell trousers a few times but it was mostly standing around (photography) and I imagine they would be slightly restrictive depending on the inner face of the fabric. The best solution would therefore be two weights for the winter.
As with all trousers, where I use my legs to support my top half when climbing a hill (no poles or single pole), the DWR soon rubs off at the thighs and I don't bother to replenish it that often. Even still, they hold off 'wetting out' for quite a while, considering how little I replenish the Nikwax. Saying that, when the snow is wet or it starts to rain on a cold summit and I cannot be arsed putting on hardshell trousers until the descent, I have sincerely regretted it, as a pair of softshell trousers that are soaked in the cold wind will quickly chill you and take much longer to dry out than a synthetic baselayer/nylon combination, once you don the rain pants. But that is a practical error.
In short: lightweight softshell for warmer weather or backpacking, mid-weight for above freezing, heaviest (with vents and crampon patch) only for very cold. No membrane unless it is very breathable. Hardshell trousers for warmth and protection.
Good luck.
NB, if you have softshell that is two glued layers, as with some MHW and Arc jackets, do not dry them on a hot radiator as the glue will permanently form creases in the fabric.