Andrew, St.Louis MO
I practice putting often all year long, use a putting mat, or put on the low pile carpet in the basement. When putting on carpet it is just a focus on path, so pick out targets like a table leg and try to hit it. I use an Eyeline mirror to focus on setup.
Past experience with mats goes back about 10 years. Had the Skilz Accelerator Pro for a long time I was actually convinced I wore a groove in it and thought it was impossible to miss so I stopped using it. Wife bought me a Perfect Practice 9’ May for Father’s Day this year. Have used it a ton. Disappointed it doesn’t sit very flat at the ramp. Added a PuttOut pressure trainer to work on speed due to the whole ramp issue of the mat.
For a Birdieball mat the best speed for me would be medium.