Without upsetting the boat here , there a few limitations a flail mower has . As i make my living with these things i know what they are . Depending on the size of the rear roller 2.5-5 kph is the speed that they can mow pasture , 5-8kph is the speed you can mow lawn . If the ground is stoney,a little rough , or has been plowed at some distant time it will bounce the mower as the roller follows the ground and can (and will) do damage (dented roller , loosening of components , damage to slip joint on PTO shaft etc ). 2" saplings is quite enough for a small flail (and that's one at a time , not a row of them at once), bigger will do damage as the flails get thrown back against the drum . As the leading edge on the mower is low , it wont allow bigger saplings anyway as you would need to knock them down first and if you do they will lay flat as the leading edge holds them down and the flails will miss them . A flail will not mow in reverse , not only are you traveling in the same direction as the flails but also the rear roller holds the material down while the cutters miss it . But because you have laid the material down going back , as you proceed forward the material is fed straight into the cutters by way of the stalks trying to stand back up and helped by suction as well as the fact they are aiming straight at the cutters . Flails cannot cut material well with the roller off the ground , the flails need to make contact with the material at it's base . Also if the roller is off the ground the top slotted link is redundant so the mower can't follow contours , as the tractor goes over a little mound the mower gets raised high at the rear and misses that spot . Flails are exellent for what they are made for but as i say have a couple of limitations . Remember to use the slotted links on your bottom arms on the 3pl , if you do'nt you will bend the mower if you go into a dip as it trys to carry the rear wheels of the tractor (steer wheels going up , mower roller comming down , drive tyres suspended ) . Also if you are mowing heavy crop or regrowth use cast hammers , i find the "P" hammer ideal .