If you have a server or series of servers that you host for your clients, you want to take this.

What I love:
1. Uptime Check Interval
Basic min of 1min to a max of 60min. interval.

2. Ping Protocol
It has HTTP(s), Ping, and Host/Port

3. Status Page
You can create a status page that has the option to change Timezone, put a password restriction and remove branding. You can also punt social links as well as email and website. Lastly, page customization can put your own logo, change favicon, custom css and js.

4. Custom Domain
You can use a custom domain either sub.company.xyz or comany.xyz and and point your DNS either by A record or cName.

5. UI/UX
It's easy to navigate, no need to have an onboarding process, you have Dashboard, Monitors, Heartbeats, Statuspage, Project, Custom Domain, and your User Profile in the Left Menu. Very simple and fast to setup, I was able to setup my first site in less than 10 seconds.

6. 2FA
For paranoid users like me who want to have added layer of protection.

My Wishlist.
1. Server/Ping locations
Currently, there are two server locations, both from the USA (New York & Boston) I want to see more servers covering the 6 continents. As I am from Asia, I would like to have Singapore, Hong Kong, and Japan. Either of the three.

Overall if you want to have a cheaper solution for Uptime Monitoring that can give you a 1min interval and a status page for your customers/clients. For $39 they are giving you enough, I recommend that to grab this deal.