No issues with bad taste for me either. I am going to buy a new bladder this season as my current CB is about 5 or 6 years old. I don't trust any bladder for much longer than that. They are reliable but also age with use like anything else. I think it's now a disaster waiting to happen.
MSR bags are nice. I use them in the summer instead of Nalgene bottles. That way they take up less space as I use 'em.
Hey OP check out CB's Snoblast model. My gf got it for me last season and it's pretty awesome. I don't know where you're riding but I used it on some 18-20 degree days last year with nothing but crisp cool water comin out. The hose is encased in what appears to be a neoprene sleeve for insulation. It's made for riding so it's got tuck-away board carrying straps too. A zipper pocket in the strap for hiding the hose and a lot of sweet little features. I use it daily riding my moto to skool/work.
I found the best method for keeping mine from freezing is to just drink more. At the end of every run I sip till fresh (eg warm) water comes through that is what I have found is best. I just use the thermal control kit in a CB hawg