Had coaching with Tony @ ukbikeskills and it's changed me completely. Can't recommend him enough!
At the time I was having a serious crisis of confidence which was tipping me on the edge of packing DH/FR in, but after a session I'm now back to my old self, wanting to jump off things just as much as anyone. Difference being now rather than just blindly bumbling through jumps and drops using full speed as a way of guaranteeing clearing something, I now apply the correct skillset to jumping and dropping and am far better in corners and pumping the trail to generate speed.
Coaching possibly isn't for everyone but for many it can make all the difference. Think of the amount of money you spend on forks, shocks, brakes etc to gain only a marginal increase in your performance - getting coached on the correct techinque is the best "upgrade" you can "buy". It's all about getting more fun out of riding and being safer at the same time.