I've been flying R/C since about 1986. It is important for you to note that speed is somewhat scale. My Sig Kadet LT40 trainer flys at about 50mph or so... Because it has a large wingspan it feels slow and docile. I also have a Parkzone P51 that is close to the size of the Stuka in question. Even though it is actually much slower then the LT40, because of its much smaller size it feels much much faster.
Smaller and slower doesn't necessarily mean that it is easier to fly.
I was the primary flight instructor for an R/C club for about 10 years. I would much rather teach a new R/C pilot on a .40 size Trainer (fairly large) than a smaller plane. It is much easier, in my opinion, for a learning R/C pilot to control and react to a larger plane than a smaller one.
I agree with that. I've been flying RC for about 25 years now, and have always found the smaller planes to be more difficult and less survivable simply due to their size. The look further away, quicker, and it gets more difficult to judge their orientation as a result. You're probably flying lower as well, so have less time to figure things out before you hit the ground or an object.
I flew a scratch-built Ultimate Biplane for a few years that had a 30" wingspan, and the combo of a small plane with hot performance was a real challenge.
OTOH, I have a .40-size Piper Cherokee that I bought/built in high school over 20 years ago that's still flying like it's brand new, and has never needed any repairs beyond replacing a few props. I had to replace the plastic engine cowl because it rotted/crumbled with age, so I bought an after-market fiberglass cowl for a few bucks that's worked awesome for the last 8-10 years. This plane is so docile to fly it's ridiculous, especially with full-flap landing approaches.
My son has monkeyed around with a few small "cheap" RC planes, and IMO they were all a waste of money. They looked neat though. Probably would have looked best hanging from the ceiling. I'm now moving him into his first "real" RC plane- a 10' span sailplane which I'm very confident he'll be able to fly easily once he learns to judge his alt and speed for his landing approaches better (he's flown my 11' sailplane at 600-800ft altitudes a few times, but I take it away to land it).