I love the offline features, the fact that no matter the device used the survey are reachable from anywhere without issues and limitations (accessible through sms and QRcode to facilitate the access), the reporting side especially to see and analyze the trends. Zonka Feedback changed and improved my way of working so far.
The only downside is having limits based on visitors but i do no have that reach currently so ideally other than this.. the deal it's perfect

there are things to improve (nothing is perfect and there is always a margin of improvement) but I´m confident that the product will evolve based on the shared roadmap