Bit Form is a relatively new product with fewer yet necessary features as compared to the other popular alternatives but it's a solid form builder with a clean user interface that offers a better user experience.
It has a long way to go to beat the competition but the product has huge potential as the developer team seems to be very much passionate about the product which is a good sign IMO.
If you are looking for a good form builder plugin with fewer bells and whistles then Bit Form could be your best investment ever.