User Manual KitchenAid KHM512OB Hand Mixers

I do not know the rpm for each setting. I simply adjust the
setting to the food being mixed or whipped.

I've never tried. However, I would imagine you could use them
that way as long as metal utensils are safe for your pots and
pans. (Most non-stick surfaces will get ruined if you use metal
on them.)

Yes, I made coconut buttercream and it handled it beautifully.
shortbread cookie dough, too. haven't tried oatmeal or
chocolate chip dough.

I have had no problem mixing cream cheese with this. No
smell or smoking. Some times I put a little milk in it to help.
Depends what it is for. Love mine. Have given frequently as
gifts.

It doesn't weigh too much.

Depends on how deep your bowl is! Obviously the faster the
speed, the more it splatters. All in all a good product.