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The Baader contrast booster is not a Moon and Skyglow + Fringe Killer, because that's exactly what the Semi-Apo filter is. The contrast booster only cuts IR with Moon and Skyglow. The Semi-Apo and Fringe killer cut the blue spectrum by 50% and as such would be better for achro refractors.
The Semi-Apo does seem to reduce noticeable CA, but as Adrian mentioned dims the view somewhat. It's good for bright objects, best left out for fainter ones. CA isn't noticeable on faint objects anyway.
If you want something cheap that works, use an ordinary yellow filter. The Semi-Apo ain't cheap, nor does it completely cure the CA.
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