First the Tartarus V2 has issues with several MMOs where keys will get "stuck" and based on googling this has been an issue with other Razer products for 5+ years. While some may have been fixed Tartarus V2 still has the issue 2 years after release.
Second, the Razer Synapse software pack suffers from gamer marketing bloat and requires you to have a razer account to even allow configuring your device.
If they go bankrupt or if I lack a net connection, the hardware stops working. Super annoying.
As for the Tartarus keys sticking - was that because it had membrane keys? Or was it software? The orbweaver has mechanical and is the main reason I bought it over the Tartarus.
My workaround is to configure the whole thing as a joystick then use JoyToKey to convert it back to keyboard inputs. No stuck keys.