I voted for the 300S. It's the best sequence plane IMO.
I do like a Giles 202 for sequence flying, but the Extra 300S is my all time favorite flying design. Just smooth and precise.
I don't really think the Yak has been the "most successful" design to date. If we're talking about RC models--it really just came on the scene a year or two ago. I wouldn't call that successful. Maybe successfull
marketing, but not necessarily successful design if we're talking about how many of them you've seen over the last 20 yrs. If they fly so great--if it's the ultimate pattern pplane in a scale platform--why are they just now becoming popular? Surely, someone would have figured it out before 2004.

Marketing, I say.
But, hey, if you like it, and it flies good for ya--then tear up the sky and have fun with it. I'm not criticising the plane--just questioning if it's REALLY been the most successfull design.
I LOVE a Cap 232 for flopping around.
Who am I kidding? I love 'em ALL!! They all do certain maneuvers really good, and certain maneuvers not so well. Each plane has strong points and weak points. You just need to pick the right one for the kind of flying you want to do that day. I have not flown a Yak. I currently have these 50cc planes--Extra 300S, Cap 232, Edge 540, Laser, Pitts. And an 80cc Extra 300L that I have not flown yet.
I don't even know whay I bought the Edge. As was mentioned earlier--they are hard to break into a spin for IMAC. I really don't care for the way the Edge flies--not at all. They won't STALL, and you need a wing that will stall at certain times in a flight. I think the reason why a lot of people like the Edge is because it will land slower than any of the others. And I hate to sound like an arrogant *****--but, I will go ahead and say it. Lots of guys can't land for beans, so they praise the Edge as a good flying plane---simply on the basis that they feel comfortable landing it. But, they will never actually ADMIT that. They just claim that it flies good--and inside they are just happy it lands like their Kadet Senior. [X(]
I like a Laser for sequence flying too, but they are kind of lacking in the tail area. I don't care for the little bubble canopy either.
Just my opinions.