I'm going through the refixing process at the moment. My current bank had offered me a competitive rate for my fixed rate but I did decide that I'd have a look at the market. It's been an excercise which has been well worth wile. I've managed to negotiate from my current bank a $2000 cash payment, a free platinum card for 2 years, and a good fixed rate. I'm waiting to see what discount they will give me on the floating rate.
Interestingly to change I have been offered by another bank $3500 with a similar (0.05% higher) fixed rate and a 0.82% discount on the floating rate. It's certainly worth having a look at what's out there as otherwise you miss out.
The other thing worth considering is what break fees would be on your current fixed mortgage. I had fixed at an excellent rate 2 1/2 years ago fixed for 3 years but now I've gotten a rate which is Better. Because of the way my bank calculate their break fees it's cost me nothing to break the mortgage.