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I went through a very long period of experimentation with Achro's and a vast array of different CA filters (not to mention many others). I personally did not like the Baader Semi-Apo filter as I found it imparted too much of a green hue in comparison to other filters.
Now, IMHO the absolutely best filter to compensate for CA (and one of the best general secrects in AA) isn't actually a filter which identifies itself as a CA filter but rather a LPR filter.
With the luxury of hindsight the filter I would recommend without a 2nd thought for compensating for CA is in fact the Astronomik CLS filter. It also does a great job at LPR.
My two cents worth and hope this helps
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