I first thought this jacket was going to be to bulky to be useful, but after my first ride I forgot I was wearing it. I noticed no limitations to my range of motion. The only drawback I foresee is that it will be hot to ride with in the summer. My actual chest size is 40" so I purchased a large. the fit was very snug but with that said it prevents the jacket from moving around while riding. Overall I fell good about the added protection from this unit. I will have to see what the durability is after a season of use.
I am 5'10" about 225 and large around the mid section. I got the largest size a available and it fits OK. Protection seems good and it seems to breath well also. Very nice protection on the back that is removable.