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Hi Andrew.
You don't mention whether your Crayford is a 1:1 or 10:1 model but generally most people upgrade for a couple of reasons:
If they are imaging some focussers are more solid and stable or have lower profiles than standard focussers or motorised control features.
If for visual use they have finer control (10:1 eg) or can carry heavier eyepieces without drooping.
Other than that a focusser is just a hole in the side of the scope that gives you a view of the secondary mirror. It won't improve the view of a better eyepiece but it may give you better and more stable control over focus and alignment.
I kept my GSO 1:1 Crayford while I was visual viewing but when I moved to imaging I bought a GSO 10:1 Crayford.
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