I have cut hundreds of Red Cedars ranging from 3" to 20". The larger trees need to be approached from two or three angles and then I sometimes have to push them over with the FEL. You can certainly cut trees with a chainsaw, but not nearly as quickly and, more importantly, not below ground level as the Turbo Saw lets you do. You "grind" the stumps of larger trees with no problem. I have also cut Persimmons, Cork Elm, Black Willows, Hackberry, and Oaks too. I can do a lot of damage in a short period of time and I am using ith with a MX5100 Gear Tractor. An HST would make it even faster. I have ordered a WR Long Grapple for my FEL so I will soon have the total package.
I spent the first five years using chainsaws. I can clear in one day what it used to take me a month of weekends to do.