Well,, usually I don't get too upset about different opinions concerning machines... but David has strung together an amazing number of just plain wrong statements in one post.....
First,,,, MB Springs are not some magical metal..they are Spring steel like every other metal spring in the world and suffer the same fate at the same rate as any of those others... and if people checked the specs on alignments they would usually find they needed new springs ( or re arched ) on our 15 year old or more cars.
Spring compressors are just tools like any other and if made of comparable material in the same shape are interchangable with the overly expensive brand names.
Springs have the potential to be dangerous,,,but lets use common sense,,, not scare tactics to address them.....