I've been thinking this also. Because I think I know the checklist well I have found I've missed a couple of things a couple of times. Like forgetting to change the fuel tank on the power checks
Personally, I'd get those ones were you'd be too busy to look at checklists commited to memory, downwind checks, BUMFFPICHH, engine failure after take off, etc. But make absolutely sure you have checked off those on the checklist when you are using it.