Personally I'd watch out for anything with a bead head. Bead heads flies like to break 4wts and under. That fly carries a ton of force with it when it is travelling past the rod tip. If it happens to hit the rod near the tip, say goodbye to your rod.
Yeah, if you rod is warranted for life that is great but that won't help you when it happens when you are fishing, plus a LOT of rods are continually discontinued and finding an exact replacement any more is hard to come by.