i bought a 5A SCO and engineered IR/MM, just for compare against 5A FSDv1 (CG double eng FSD IR/Fast Reboot) with MM.
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Yes, it is a bit better for jump range, so if you do not need SCO you can keep you FSDv1,
i will not change FSD to all ships in my fleet, expecially on the ones equiped with FSDv1, but why not on dedicated explorer/exobio for a bit extra jump range and quicker in-system travel, daily run bubble hopper, ships with FSD size above or below 5, because i have access only to 5A FSDv1 and miss other sizes CG FSDs.
(and here come the big) IF engineering rewamp will be less grind and more fun, why not* on all ships in fleet, without a drop about the time I "wasted" in gathering mats for FSDv1 in past.
* the 5A FSDv1 two second reboot could be useful, anyway i saw all Engineering and Experimental modification are available on SCO.