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Well I'll be the fly in the ointment. Atlas is no doubt a great focuser but its very pricey so I think you would want to use it when it matches the cost of the other items.
I used a FLI PDF extensively and it was flawless in its performance. I never had flex, always got precise focus and it just did its job.
I used it on a heavy FLI Proline on a Tak BRC250 and also with lenses, some other scopes as well.
Some imaging trains have gotten heavier since then so basic engineering would be to overengineer your weight carrying capacity by a multiple. Like overmounting a scope is better than mounting at or over its capacity for optimal results.
Some scopes are more sensitive to focuser flex than others as are cameras. Which camera and scope are you planning to use it on?
Greg.
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