Chain replacement - advice please
In the last year my rediscovered enthusiasm for cycling has transferred to my family, which is fantastic, apart from the fact that it makes maintenance potentially expensive.
Two of our bikes currently need their chains replaced, my Specialized Sequoia is used for rides of up to 200k, my son's Trek 1000 for rides of up to 100k and criterium racing.
Does the price of the chain reflect its performance? My main concerns are reliability and shifting performance - weight isn't a concern. I'm looking at KMC chains at around a tenner, would spending more make a difference? Any advice would be greatly appreciated.