I originally started with Splashtop Business for Remote Support (100 computers) at $249/year but recently changed to Splashtop Business (3 users) at $180/year. Purchase of 3 or more users for $180/year gives you access to an unlimited number of computers. I made this change mid-year and they prorated the payment and renewal date.
I also have a license for Splashtop On-Demand Support - 1 Technician at $100/year. The On-Demand support is excellent and easy for end users to initiate. The only issue I have is no automatic reconnect on reboot, but hopefully, that might be coming at some stage. On-Demand uses a 9 digit code without a password for connection and the code changes each time you run the application, so you need the end user to restart the program and give you the new code if you need to reconnect.
With most remote support jobs, I get the end user to make the initial connection with On-Demand. Then, when I remote in I install the client for the Business version silently via a script. This gives me continued access for the length of the support session and makes reconnection after reboot possible. At the end of the support session, I run Splashtop’s CleanUpInstaller to completely remove the Splashtop client.
I also have a Teamviewer subscription, but will not renew it when it is due. I prefer the above Splashtop combo even without the reconnect on reboot.