Bernard,
There were two reasons for the purchase:
First was to actually "handle" and use the SA100, so I could do a full Review on in for other amateurs. Secondly, as you say to get the zero and full spectrum on a small CCD chip.
I find the Baader is excellent. No need to replace it.
I also had a RO, but ended up having to return it as it started to "fog" and de-laminate.
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