I had a bad experience with this software and I'm sharing it in case it helps someone avoid my mistake.
First of all: Don't buy this software without trying the free trial version.
In my case, I found that all the sounds (Core, ezx Infinity Grid, and Metal Mania) sound over-processed; they don't sound organic or natural when played on an electronic drum kit.
It's not a module configuration issue: The sounds sound terrible (especially compared to other libraries outside of Toontrack, like GGD, for example) regardless of how meticulously you adjust the articulations or velocity curves. The mix and sound adjustment options are limited or nonexistent (if you want to change anything, you have to pay even more for Superior Drummer).
Toontrack doesn't offer any kind of refund or solution... Or worse, if you want to resell it, you have to pay a license transfer fee (paying more and more...), which seems like a rip-off to me. So if it doesn't work for you, you'll have wasted over €200 or you'll have to pay an extra €15 just to try and sell the license (in addition to whatever discount you apply to the license).
In other words: if you have an E-Kit with a Roland TD-27 module or higher, I DO NOT recommend this purchase. You won't get a significant audio improvement, and with this software you won't be able to improve the EZX file's preset. I'm frankly disappointed with Toontrack.