What does Unbounce do well? The landing page is robust, the allowances for number of pages and leads is great, and this is a good solution for clients whose website may be dated or otherwise detract from closing new business. The organization may want to build a new site but that doesn't stop the need for new business outreach.
What does Unbounce not do well? My biggest issues (AMP capability and domains) have been addressed in the current service offering. I think Unbounce is a good solution that can ramp with a marketer's skill level. Want to do real A/B testing? The system will handle it. Want to import templates? Can do that too. Want to exclude IP addresses from any data? Sure.
What do you wish you had known about Unbounce before using? Templates are in the eye of the beholder. I believe that the template library should be revamped. And I had some rework in front of me when I tweaked an existing responsive template, broke its responsiveness but the system didn't flag me. Knowing that it won't is fine, but that was unclear in the user interface.
Have you used a competitor to Unbounce? If so, how does it compare? I've used several including larger ones like Instapage. For my needs, Unbounce is a perfect blend of price, functions, and quantity.