I've been messing around with free profiles (from the online Rig Manager) with my Kemper and while there are some decent profiles there, I was never really convinced.
From the first time I tried Kemper, I instantly loved the "TAF \m/ Van Halen" profile and I still do, and no other profiles have really had "it" like that one... But I wanted to try some more and finally decided to buy a commercial profile pack.
And what better place to look for than The Amp Factory and their 5150 profiles? Hehehe! Downloaded and while I initially thought "well, it's good" it wasn't until I started tweaking with the settings it really shines... EXCELLENT thrash metal sound. String definition from hell!!!
It's the first time buying a Kemper profile pack and I might do it again, seems like it's totally worth it.
Here I play some random thrash riff with my Fender Musicmaster loaded with an EMG 60 in the bridge.