Yes very nice....and very dangerous in Impetus 
I was able to field the units I had finished in a quick game against some Swiss. (not a fan of the pikes...they are evil

) I did find the Veteran Order were stellar, very dangerous as you said. Everything they came in contact with they pretty much cut through like butter. I am working on a unit of Order Knights to go with them now.
I used to use 15s for all my ancients a loooong time ago always looked terrible when I painted them
. I still use 15s for my AK-47 armies but Modern(ish) troops are generally skin and one colour uniform so hard to screw up. I suppose being brought up on Warhammer as a kid 28s (or as they used to be 25s) are always the scale I feel most comfortable painting and get the best results from.
I can understand. I have a friend who is one of the best painters I know and he prefers 28s as well. Its all up to what you enjoy. Once of the cool things about this hobby.