EPP for slope for sure but when it comes to thermal flying it takes a model of sterner stuff. You show me an EPP model that is thermalling and I'll show you a thermal full of hats, dogs and small houses as well as that glider...
If I'm wrong please provide some links. I'd love to be proven wrong for this one as I think EPP has a lot to offer for a beginner model. But so far being efficient enough to fly well in thermal country isn't one of them. If an EPP model can't come darn close to matching something like a Gentle Lady or a Spirit then it's not worthy IMHO.