>I wonder if anyone ever has problems following it

Pomo is best for people who have trouble staying on-task. You see the countdown in the corner of your screen and focusing isnt so bad because you have a specific end-time. But, in my experience it only works well if you are the sort who doesn't get a lot of interruptions.

I use a printout system (Emergent Task Planner) plus Clockify to help track the real time spent on each task. It works ok and my time is billable so accurate timekeeping is a must.

https://davidseah.com/node/the-emergent-task-planner/

eta: i also keep an analog clock on my desk. I didn't bookmark it but sometime ago I read a piece on here about how digital clocks aren't good for measuring the passage of time and I think there really is something to it.