Well, the diff held up fine, until i've abused the living sh*t out of it.
I'm not joking when i say i was sideways the whole day in almost every corner. They even gave me a nickname in the pits... "The drifter".
I will probably not do this again in such an excessive way. I've learned my lession. Spirited driving and some tail out moments here and there are no problem however.
I like to replace it with an OEM one, since i like to keep this car stock. It's a great car and i love the handling (with all the things that are "wrong" with it, like bump steering (earlier models), etc.).
Plus i've been told by several people, including a high up tech guy from honda switzerland, that if you make the diff stronger (replace it with a better one), other parts might break instead, like the driveshaft, or transmission, etc. This would be a little more expensive to fix than a new (used) differential.
And again, i really like this car how it is from the factory. I'm not gonna risk ruining the smile on my face when i drive it, by replacing stuff with aftermarket parts.
PS: The "used" diff has 17'000km on it, it's like brand new for the third of the price a new one would cost me.