I’m a WS Form Pro user who had a short experience in the free version which is packed with features for a free WP plugin. The Pro version takes it to the Best-In-Class level. I’ve used a couple other popular ones – WS Form Pro is just light years ahead. The code base is solid, the database structure is well engineered, and complex forms can be built with relative ease. Decision logic is fully featured with the ability to nest complex routines & validations. The submission workflow is well thought out – likely you won’t need an automation plugin to handle the majority of needs. The docs are well written and easy to follow. If you get stuck with something, the support is stellar with rapid responses. Don’t think twice – just make the change and you’ll never look back.