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Well, I was tring to avoid the brand thing, and just talk about focus consistancy (not absolute focus, which granted is tighter on the RCOS).
There well maybe other reasons for the focus change, I dont know, cant see any.
The focuser I use on the Meade has temp compensation (TCF-S), which I never bothered calibrating, dumb I know, call me lazy, would probably solve the problem in one hit.
In the end, the diff bettween aluminium and CF is there and significant IMO, but can be overcome with care or a temp compensating focuser. Whether the cost difference is worth it is another story given focus drift can be overcome, but as Peter says, its the last mile that costs...... And the convienience of no drift CF to start with sure makes imaging more enjoyable.
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