I have been using recently turned metal pitot tubes in 1/72. They definitely add something to a model, make it's nose slimmer and they are often turned in the complex shapes the real pitot tubes use. I have used them on F-106, Mirage 2000, Mirage III and other models.
I buy them from EvilBay for a few dollars (Australian) and they are well worth the price. :thumbsup:
My only concern has been the fragility of their mounting. They are sometimes easily knocked off!
They are also available in that infernal 1/48 scale, the work of the Devil, I tell you!