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Well this will likely get a lot of posts, because most people have a view (haha). Yes a Cheshire can be good enough, provided you know what your doing and what your seeing. Everyone should have one and know how to use it.
Personally I prefer a good laser for precise collimation of any Newt or dob. The issue you will find with an f4 is the secondary offset, and I suggest you read Astro Baby's excellent article on collimation, which shows photos of the differences in offset between and f4 and f5.
And as always, a star test is the final arbiter, but again you need to be able to read what your seeing, inside, at, and outside focus.
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