If Xur is indeed going to be selling the upgraded versions of exotics from next week, as well as them being made drops, I'd rather just buy the upgraded versions and save myself an exotic shard (or two!) and 7k Glimmer.
I do think that if they must go with this system then if you've already spent an exotic shard on the final node of an exotic then you shouldn't be asked to spend another. It shouldn't be two or three, it should be two.
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With that thought process and if you have 20+ exotics, you might wait weeks or months before one if your exotics shows up for him to sell. Be serious. Unless your a casual and just have a few exotics. It's al good then.
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Well yeah I might not do that with [i]every[/i] exotic but when the cost of upgrading is exotic shards and glimmer versus some strange coins surely you can see where the temptation is. Not to mention I'll get a shard for dismantling the old version that I can use to max the new one if I want.