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Occasionally, I've not done any side-by-side comparisons but I can't see a significant improvement with the filter-specific burrs. Oddly enough, at very coarse grind settings, the filter-specific one produces a lot of fines (much more so than the original one). I'm not convinced it's worth the £30 personally. Do need to have some proper side-by-side comparisons but the regular burr is perfectly fine for filter brews
Flip between espresso and filter (normal morning is a filter for me and flat-white for my wife). Mid-20s for filter generally and around 2-3 for espresso on my machine. It does (as you're probably already aware) have 3 different timer settings so setting it up for both shouldn't be a problem. Though I just single-dose so use a single timer set to 10 seconds and shut it off when the beans have all gone through.
Feel free to fire over any questions about it.
Just found this video of a shim addition, 3 mins for a guy giving a walk through of how to do it: https://www.youtube.com/watch?v=7sBpJcsF7-4