a. Ability to add multiple questions to a single survey (it is shown as one question at a time to the user).
b. Ability to target these surveys on advanced parameters, like -
Referring websites (e.g show a survey only to visitors from Google).
Cookie, Browser and Platform based targeting.
URL pattern based targeting.
For "first time visitors only" targeting etc.
c. The aggregate response to each survey displays visual charts on survey performance, answers to the survey, user demography etc - these stats are comparable to best survey tools out there.Do give it a try - http://webengage.com. Look forward to your feedback.