Yes, I'm sure everyone would fly the Yak-3 for a while, because its new. EVERY new addition has that effect. I haven't seen one that doesn't at any rate.
But the question is, how long would you go back to the Yak-3 for? Would you make it your main ride, or one of them? Or would you take it out for a few spins, decide its a bit better than the Yak-9, replace said yak in your favorites list with the Yak-3, and then ignore it for the most part, as most will do?
Its HIGHLY similar in preformance to our Yak-9U. I think its about 7mph slower, and climbs about 400ft/min better.