I purchased the highest-tier plan.

While the service itself functions adequately, I have several concerns:

* **Support** is extremely slow, unresponsive, and lacks clear explanations about credit usage.
* The uptime monitoring feature abruptly stopped working. There was no prior indication that it consumed credits.

If uptime monitoring indeed counts against credits, then the provided 30,000 credits—even with "unlimited website" usage—is insufficient, especially for larger websites. Based on these issues, I wouldn't recommend this service for high-traffic sites.