We have been quite impressed with the RST jeans are for a number of reasons, the cut is like a regular jean, it has some spandex woven in so they stretch or give, and when the knee armour is out they look quite normal (no baggy knees).
They are half lined with Genuine DuPont kevlar on all the important bits, I know some are fully lined but below the knee we have motorbike boots on, and in my opinion most lower leg injuries are to ankles or impact injuries which won't be stopped by some kevlar.
The knee armour is first class and there are pockets for hip armour to be added, But the main reason I like them is that the knee armour is adjustable up or down (like my expensive BMW textiles) so you can get the perfect fit. This may seem minor but, after trying loads of pairs from different manufacturers I found often the knee protection sits in the wrong place, too high or generally too low. Maybe I have odd legs! But these jeans cover this.
I ordered 2 sizes from Sportsbikeshop because of their free returns but went with my regular 34 waist, If you like a tighter fit you could go a size lower than normal as they are a comfortable fit.
They are still warm in the sun due to the kevlar but don't get as sweaty as textiles, we rode in 36 plus degree heat in them!
They definitely look more casual as you wander around and you could take 1 pair less trousers to keep packing down.
I've worn these through the winter with waterproofs when it's wet and without when its dry, and they are generally warm enough,
I (happily) haven't tried abrasion test on them but expect they would fare as well as textiles, great for touring and short runs out.
Overall very happy.
You will not be disappointed. Oh and the price £89.99 which is excellent as well.