I think Marc's got the right idea on this--unless you have a problem, don't fix it.
Typically stabilizers are used with a thin kerf blade. There are many reasons but I think the two most often cited are the blade might flex and not run true and second the saw vibrates too much.
The thin kerf blade has some advantages and application, but if you have to add a stabilizer (sometimes called a stiffener), maybe you should just buy a regular blade.
Second, if you have a vibration problem, I think there are lots of other places to look first, rather than the blade.
If you really "want" a stabilizer, try to avoid getting a "pair" of stabilizers as the one that goes between the arbor and the blade will throw off your rip scale and I don't think they make any difference. The single, large stabilizer may prevent you from raising your blade to its maximum height.
I like to think the single, large stabilizer is effective. :) But, if I had it to do over, I would get a regular blade and forget the stabilizer/stiffener business.
In reviewing "user comments" on Amazon, reviewers for both Freud and Forest blades strongly recommended stiffeners. As I have recently gone to a 12inch blade, I anticipate more flex, but,perhaps the greated diameter creates more centrifugal force and promotes a more stable blade...all theory. Think I'll look for a good standard width blade instead of the thin kerf variety.
Just yesterday, we used clamps after glue simply to take the bow out of the wood we were using, and it straightened everything out for us. Usually though, any time you lay up a project the clamps are...