My LR2 is working non stop cutting pvc and pdvf sheets for making signs and it has been GREAT to say the least.
The lr3 how much better it is in comparison feeds/speeds
Im using a 5A small spindle ( https://a.co/d/8kkBWAf ) ( and pretty much would like to keep using it (low noise and my whole cnc runs with battery backup and solar) with a 6 pack fluidnc board
For me upgrading from the Lowrider 2 to the Lowrider 3 was practically all upside and improvements. The only downside was losing a little bit of cut width and needing to think pretty carefully about how to implement on my existing table without losing more cut width than I could afford to lose and still meet my goal of being able to address full 4 x 8 sheets without having to modify my existing table.
I concur which what Dan @SupraGuy said. The tool mount on the LR3 can be remixed to suit if the existing options don’t match your spindle / router. If the spindle’s diameter is less than the smallest tool mount opening, then a “sleeve” expander could be an option.