Some people have an OS fixation. Marketing does indeed work.

I tend to think that a 14 year old is going to want to move on from the trainer fairly quickly. Why not purchase an engine that will continue to be useful on a second or third plane?

What I've learned from many years of doing this is that I don't enjoy misbehaving engines. I do enjoy a wide variety of engines. If a person can get beyond the marketing, they can find quite a few great engines out there. If I were a beginner without much to spend, I'd look at a Thunder Tiger 46 Pro or the TH46. Good performance for the cost of a low-performance OS. OS is a brand I largely avoid, because for the prices involved there are much more interesting engines out there. My experience with OS is that they're fine engines, but not the most cost-effective.