I had them on Hope Mini brakes years ago and the got some Deore M525's for my "second" bike. The Deores were cheap but way way better than the Mini's with braised hoses so I think you are better off with better brakes in the first place.
The difference I felt between Mini's before/after braiding was marginal if totally nil so I say you should save your money unless you like pimping your ride or wasting your money.
Alternatively send me £50 and I'll pray to the mountain bike gods that you'll be a better rider in 2010. That will be a better way to spend £50.