Budgeting Tool: has anyone used "Retirement Budget Calculator"

Budgeting Tool: has anyone used “Retirement Budget Calculator” https://retirementbudgetcalculator.com? I understand it recently won an award for best budgeting software/calculator. I am playing with the free version, and it looks good. I do not want to invest much time in another budgeting tool if others have a poor experience.
Thank you in advance for your feedback.