I don't know of anyone blowing a coilover and if I have it was only once, but at the same time I don't recall hearing more than once of someone blowing a strut/shock either which could have been from numerous things. Basically, unless you AutoX or need to adjust your ride height at random, then you might as well save your money and go with just swapping springs. Just my $0.02
Jason Damron, San Diego, CA, Supercharged 2004 Vibe base - Gone to the wind My Vibe pics on Cardomain2009 Chevrolet HHR SS!