Nothing much new to be read here that hasn't been said before. Hoever, make a note of this and perhaps be enlightened:
1. Nick Barker cheats. The drums for Bimmu Dorgir are quantized and in some cases even programmed.
2. Trym is a great drummer but nowhere as fast as Hellhammer or some others. During many Emperor recordings they had big problems with his speed.
3. Speed isn't everything, technique isn't everything... tastefullness, creativity, and knowing what to play at the right moment however, is!
Now about trigging, contrary to common belief, trigging is nothing other than the replacement of an organic sound by a sampled or synthesized sound. The drummer still actually plays the hits, either on a regular drum-set or on a pad, which is just as velocity sensitive as a regular drum.
The only difference is that a regular bass-drum often sounds like crap, while a triggered sound sounds more controlled and smooth. It's a matter of taste, but try getting good sound out of a real bass drum and you will work long and hard....