Fairly extensible configuration and customisation mean that the functionality of the queue itself, the user experience and visual impact can be controlled to a good degree. Different levels of integration, and associated pricing, allow for different levels of control and reporting.
What do you dislike?
The frontend integration offers fairly limited reporting and requires very manual control of an event queue, so using the solution for crowd control becomes a very manual and relatively difficult task.
Some of the concepts and processes are somewhat difficult to grasp and not very straightforward to work with - some abstraction and simplification of the UI might be helpful.
Recommendations to others considering the product
Use for a reason that suits a queue rather than a sticking plaster for site traffic issues, this is better used as a marketing tool than a technical solution.
What business problems are you solving with the product? What benefits have you realized?
Alleviating traffic restraints on managed hosting servers by restricting the inflow of visitors to site. This has the impact of maintaining website performance for those visitors who do come through to the site, while providing those in the queue with adequate information on their position and expected waiting time. A side-effect that we realised was that conversion rate had increased at a level much higher than the reduction in visitors to site, increasing revenue - especially when one of the potential outcomes during peak is server overload.
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