I love how quick my survey was sent out with no delays or issues! It's great having this option for our clients as they are able to get their feedback right away without waiting weeks/months like other surveys do sometimes (we also use them internally).
There really isn't anything i dislike about flexmr so far but if there were improvements would definitely try again next time around!! We've been using these questionnaires since we started providing online services back when only 10% used those methods - now its over 90%.