I've completed my first Form done with Bit Form. The process for creating multistep form that has some conditional fields and send different email to user and admin was fairly straightforward (nice that you can setup smtp in Bit Form - don't have to do it via another plugin).
I've encountered few bugs in that first build and didn't really received help from support (probably cause it's busy Black Friday time):
Advanced Upload Fields cannot be added to repeaters and simple upload fields can - but if you do they do not send files as attachments.
Signature in emails is not exactly working (it tries to access signature file which is denied by .htaccess rule set by plugin itself or maybe it's hosting? Don't know as first support reply was basically "it works on our setup..."
Also repeater fields with upload are not easy to view inside submissions area (three click to get to file)

Overall good (for the price), but with a lot of room for improvement.