This is required kit if you plan to do Missions - and is also pretty darn useful if you want to convert your grass fields and easways into bales. Just saying...
Again these are used primarily for the Missions. That said, you will find that the best combination is to pick a tractor that has at least 200 hp or better, and equip it with the Kuhn FC 3535 and FC 10030 so as to achieve a reliable 9.9m swath of mowed grass.