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Generally a no-no amongst domainer circles and it's an expensive no-no at that. I have just one .bz domain in a keyword that I particularly want but you would be hard-pressed to convince me on the necessity of getting another.
I had no problems with propagation, but it was a purchase rather than a new registration.
As I said it was a purchase from a fellow domainer, so I did not use a registrar to register it.
It is currently with Namecheap and registration/renewal with them is $28.88 - I would get it for $24.95 at Enom but I am not familiar with prices at other registrars.