No experience with those but I've had a lot of experience with these. They work as advertised. Once the tree/sapling gets smaller than ~1" it's kind of hit or miss but larger they work well using a tractor, ATV, riding mower, truck etc...
https://seattle.craigslist.org/skc/tld/d/auburn-wilton-35-combination-pipe-bench/7338717713.html
If you check their website under "specials" you'll find it for $425 shipped. He has a limited supply.
No connection with them but this family owned buisness produces some of the best 2x72 belts I've used and at a moderate price. Shipping is prompt and if you have any questions you can call them up and speak to an actual person that knows something. Most of what I use is 36grit and it last...