I had the 109 and the Spitfire and both had significant problems. I documented them and told KMP's owner at the time when he was distributing ESM but it didn't matter. The molds are bad, the fuselage masters are not symmetrical. I had to modify the 109 saddle to level the wing. I started to do that on the Spitfire then I said to heck with it and flew it as is. Both planes didn't fly well at all.
I had two Spitfires and one 109.
I examined my friends FW190 and Hurricane ESM kits and the same thing was going on there too.

Thats 4 different models with the same issues!

So so if your into paying to modify planes then go for it otherwise stay away, not worth the headache and loss of cash.