Ive now managed to hook the raytree REDM32 onto my excavator & ran it for a full day. It did a good job of dealing with a lot of overgrown & out of control loreal maybe 25 foot tall most of which were around 4 or 5 inches thick some much thicker. It was quiet & well balanced. I was pleasantly surprised how well it got the job done. I can't know about how reliable it will be but so far im really pleased with it. Ive seen guys on youtube using one on smaller excavators but tbh I personally wouldn't want to use one on anything less than a 5 ton machine not only would they be limited in reach but the weight of the mulcher is enough to get yourself in trouble paticularly when working on slopes or over the tracks but evan with a 5 tonner you would do well to go slowly if your inexperienced at working downhill with a heavy implement. I took a quick video of it in use but it was too large to post on this forum so I put it on my Facebook if anyone's interested in seeing it in action if it helps.
Video