30 million is a fair deal for two players who have made more than 100 appearances each and they are just 24 years old. Asamoah is quality and he can covers all 3 positions in the midfield 3 , and we already have United who placed in a 12million bid. Obviously, we have to place a higher bid due to that. Considering when clubs like Man Utd and Liverpool paid 20 million alone on players like Henderson and Phil Jones, this transfer fee is definitely not overvalued. Basically it depends on how you see it.
I would say that the actual amount will turn out to be around 33 or so for both, which I think is a fair, or pretty close to it, market value for them, hype and all other things considered.
That however is not cheap by any means and my point is more on how much value would Juve really be adding to the team for that amount - I don't think Asamoah can burst into the starting 11 w/o making Juve a bit too predictable in midfield (more precisely in attack), i.e he would be basically a depth player for you, imo.
Isla's best role is really a wingback so he can be an improvement over Licht in the 3-5-2 but mostly in home games as Licht provides better defensive cover on the wing.
True that Isla can and has filled in at several other roles but he is not exactly great at it - he's still at his best as a right wing-back and is still a player for whom it remains to be seen how high his ceiling really is.
So, again, two good players for whom Juve isn't grossly overpaying but isn't exactly getting them on the flea market either and who have yet to be really tested at higher levels of football.
Do you think Milan signing Stephan El Shaarawy at 20 mil is overpaid ?
that stuff was too shady with players involved and what not - to know what Milan really paid for SES but if it was indeed 20 mil, and most of it cash, then yes, they did overpay. Here it mostly about the potential, again that word

, shown by an 18 yo, not a 24 yo, which is why Milan co-owned him first and only then decided to buy him entirely ... but again, about 5 mil more than what I would have valued him. (again, I am not sure what SES really cost Milan, but I am referring to your mention of 20 mil or so)