Ok so I went up to xur, with my Sunbreakers and my exotic shard, and he had my sunbreakers in one of his "upgrade exotic weapon" slots for the week all highlighted for me, so I thought "Oh good, I can upgrade my sunbreakers, thats great".
Except when I selected it, instead of upgrading my sunbreakers... they are just the same sunbreakers as before. Except now, they have zero experience, so I have lost a week's worth of XP gains, as well as 7 strange coins and an exotic shard and 7000 glimmer....
Umm, what?
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Xur's upgrades are for exotics obtained [i]before[/i] the expansion was released. It allows the old 300 atk and 30 light exotics to upgrade to 331 atk and 36 light. They're also great of you got a new exotic with a crappy stat roll. Bungie isn't going to refund your materials. Next time take 2 seconds to compare before you any upgrading