I really like JotForm products. They were already a rock star on desktop, and now they are ruling the mobile. They provide just what I need.
Fast and optimised solution for mobile forms. Easy to use. Intuitive.
I need to use it more to find a con.
I have been using JotForm for a month and its really useful, I really appreciate they finally published mobile support. It's great!
Simple, user based design, quick, cheap (mostly free)