I just want to know if it is a good idea to change my normal-runner shoes to shoes with spikes for running. Is it a good idea to use spikes in a 800m and 200m race? Long-Jump? and a tug-of-war?

A friend told me that if you use spikes- you have to be used to running on your upper-foot only but I normally run on my heel than to my upper-foot-is it hard to run with spikes if you normally walk with your heel-first?

And one more thing:
Does Nike, Adidas make shoes with spikes?