Ok, I've not actually weighed anything but according to RealOEM (bare wheels);
Elipsoids 107s are - F 13.05kg & R 13.150kg
Split rim 5 spoke stars 108s are – F 12.99kg and R 13.15kg
M Spec 224s are – F 12.15kg or 11.9kg post 12/07 and R 13.65kg or 13.2kg post 12/7. Love to know why the 224s were changed and made lighter as most M's on the road were built before 12/07 so unless they've had their wheels changed their running the older slightly heavier version.
Anyway back on topic, at F 15.2kg and R 16.3kg the type 63s are massively heavier, this will be further compounded by the bigger heavier tyres needed. I assume the wheels need the extra strength/material to support the weight of a 2 ton plus SUV.
It reminds me of when my wife had a R56 Mini and a certain type of 18 inch aftermarket wheel was all the rage on mini forums etc (looked quite like the type 63s actually). We got a set and boy were they heavy compared to the standard 17 inch ones with runflats, even with normal tyres on.
The car looked really cool but it didn't drive as nice and we eventually reverted back to stock. However most owners loved them and kept them on. Its very subjective this sort of thing, some will love the difference they make to the drive, some wont even notice (there the ones you really worry about!

) and some will think "I've ruined it, back to stock ASAP!"
To be honest the loss of tyre sidewall between 18 and 19 inch will be fairly detrimental and the extra weight will just compound things further but if you like them and aren't bothered or actually like how they make the car feel then fill your boots!