B1 price is a little scary, but I expect it to last me for decades (other than the battery, which I plan to be a 2-3 year thing). One of my D1s got knocked over and the only impact was the glass plate knocked out, easily put back together. A flash would have probably cracked or shattered from that sort of fall.

I spent several years using a 580EXII as master trigger, then several years pulling my hair out with PW Mini/Flex. I slowly got good at balancing ISO/aperture/shutter so I'd have enough oomph from the flashes without having to wait a full 5 seconds for recharge, only to find pink color shifts and excess grain in my flash-lit shots. Now with my pair of D1s, it's ISO 100, f/whatever I want, and I have enough power to overcome a softbox with both layers of diffusion in, plus the softgrid. The B1 will give me cord freedom and hopefully power-up-and-ignore freedom when popping into a hospital room for a photoshoot, or at my day job where I occasionally get called for a hallway "award winner handshake" photo, etc. Yes, one B1 with remote is about what two D1s with remote costs, but there's a feature set to be had.