M.P.
Hi S.,
My son (who's now 2) was extremely picky about his cups. I seriously bought every type babiesrus sold! We ended up with the avent cups. I liked that they went in stages, the white for when he's little, then the soft green, and then the harder green spouts.
They can be a pain to clean, because they have the 3 parts, but if you don't mind then I think they were great. We haven't had any leaking issues, but i have handwashed them most of the time. I'd also recommend buying the little tiny cleaning brushes (they're made for dr. brown's bottles). They get in the crevices really well.
good luck.
M.