You'd really need to ask for owners of specific telescopes you are interested.
I am basing that comment on a Tak FS152 with a 2.7 inch focuser. I tried various flatteners etc and got very bad vignetting.
I ended up upgrading its focuser to 4 inch and it was all good.
Someone posted they had success with a TOA130 and 2.7 inch focuser so perhaps it was a better flattener than the one I used.
Greg.
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