My 40ft Adams had a bowthruster fitted before I bought it and although some people think it is cheating - I only use it when I feel it is necessary.
If there is a chance of impending doom, rather than wait and see if an unusually strong wind is going to blow me onto some rocks, the wharf, jetty or that multi million dollar yacht, I'll use it. If needed I can just about spin her on the spot - going astern.
If you are flush with cash, go for it.