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@Sparky
I used the BB30>Shimano converters that came with my frame for a bit but they were super-creaky. Then I bought the Praxis thing and it was quieter. Not completely quiet though. Overall worked well.
My bearings have just died after 1,200 miles which is a pain, and they're not officially replaceable. You lose warranty if you do it. I've just ordered replacement bearings for £15 from Sigma. I'll find out next week how hard it is to replace them.
You need two BB tools to install it - just something to bear in mind.