I am also thinking about jumping on the dutasteride train. From what I have read browsing the forums, it seems like the majority of people who have tried dutasteride have gotten along pretty well with it... noticing a lot of thickening or at the very least maintenence.... for some lasting up to 5+ years. Do a search for skylineGTR he had one of the best success stories I have seen on this forum. There are however few people who have claimed that dutasteride seemed to have made their hairloss worse. If you have not yet tried finasteride i would suggest using that first. If you are on finasteride and have been on it for 6 months to a year and haven't noticed any improvement, then i would suggest researching more on dutasteride and looking into it. As I said i am also looking into it, I have been on finasteride for a little over 2 years and it seems like the finasteride is no longer maintaining as well as it used to. I'm going to look into dutasteride and I will keep you updated on what I find.
One more thing... check this thread out, it lists some experiences of other dutasteride users on the forums.