Thank you for your detailed feedback; I'm sure this will help future customers. I've looked through our 3-year-old conversations and seen a few questions, but nothing regarding tractor power or what you are cutting. Regardless, in this case, the WFL125 would have been the more suitable machine for this type of hard use if you aren't cutting regularly. 25hp is well suited to powering the WFL145 during, as you say, frequent/light cuts. For the harder vegetation, a slower forward speed is recommended to allow the mower time to cut. Tussock grass is a tough one for any machine to tackle, as it grows in incredibly dense mounds, but I'm glad that you've been able to keep on top of it by cutting more regularly.