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The notion Astrodons are 1:1:1 is rather fanciful as all they are doing is leaking signal from R to G and G to B which simply gives you less saturated colours.
The basic physics was established by Helmholtz well over 100 years ago.
That is not to say they are not good filters...they are excellent....but the 1:1:1 exposure times is not a good reason to purchase a set.
Don's narrow band filters are rather awesome...sadly with the current debased $A... in both price and performance, but if you are ultra-serious I can think of none better.
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