I wonder if these tree "stem splitters" are using the same AI engine or if they have developed their own AI engines. If they are using the same engine the quality ought to be the same. But if they have developed their own engines the quality may differ. I don't know the technology used but if they using some level of AI analysis and deep learning I would have thought it to be quite a major work to collect all the data needed. But I don't have a clue how these engines work and how much work is involved to get one working.