We used to use and still do use as a backup gotoassist.
Why because splashtop doesn't always connect.
In bad network environments splashtop will fail to connect where GTA is persistent and will connect and reconnect where splashtop fails and exits.
Support for dual monitors works better.
On slow links the compression on GTA works better, is smoother.
As and example I still have a lot of our old contract customers still on GTA and I've had splashtop fail to connect many many times where GTA goes straight in without even a hiccup.
If I could get that level of reliability its another tick in the feature parity box and I can look to cancel our GTA subscription.