I use a number of forms that handles requests from about 800 users and it is flawless.
Ive recently had a reason to request support as I have been upgrading my forms and I must say nothing is too much trouble. Markus Bopp has been helping me and its quite clear he is a talented individual.
The software is very complicated but I found the numerous examples were enough to help me on my way.
Super thankyou very much.