Agreed, their software is utter garbage.
There's the Onboard Memory Manager though, which does everything you would ever want without the gloss, bullshit and bugs: https://support.logi.com/hc/en-au/articles/6449584392215-Onboard-Memory-Manager
I like their hardware but if they ever make it incompatible to this software, I will stop buying it.
I actually really liked the G602. I know I am in the minority though.
If they remade the MXmaster 3 with the same number of buttons as the G602, I would be pretty stoked. Love the scroll wheel and button feel of the MXM3. Its cursor movement feels buttery smooth, and it's shape still feels good after 8 hours of REVU markups.
G602/4 gang! I picked up a Razer Naga Pro to play around with since it also has a 6 button side panel that is hot-swappable for a 2 or 12 button configuration too. I think the Logitech mice are more ergonomic (but I’ve also been using the G602/4 for years), and I hate the Razer Synapse software. Being able to switch to a 12 button panel for some games is useful, but I find 6 buttons to be the sweet spot for general computing. I think the Naga Pro is the closest option for the time being unless Logitech decides to introduce a new model.