About size:
At vg2, Kinga seems to be about four inches taller than Janet (duo). I have no problem with that.
But a foot taller? I think I would have a problem with a duo if one girl had to look WAY UP to see the other girl's face.
Otherwise, I love the girls.
Breast size does not matter to me. I love them in all shapes and sizes. From the tiniest of breasts (have not yet seen any here that small) to really big breasts (bigger than any girl here so far).
edit: For me, breasts only need to LOOK GOOD. To me, fake breasts look good except the huge ones that that LOOK fake. To me, real breasts look good as long as they hang (sag) no more than just a little.
Firm breasts are always beautiful.