The only one I regret dismantling was my second Vision of Confluence. I had been holding off taking apart any of the Vault of Glass raid weapons....but FINALLY gave in and took apart a duplicate VoC because of the lack of vault space. If I'd only been able to hold out a few more days..... Nice to know that I'll be able to keep using Corrective Measure....and will be able to update all my VoG primaries. In fact it may be worth going back to the VoG JUST to get Fatebringer, now.