I like Meshuggah a lot, but haven't bought Koloss. Most feedback seemed lukewarm on it and the couple songs I heard seemed kind of boring. On a possibly controversial note (it shouldn't be at all though), Contradictions Collapse is not only a good album, but very overlooked by fans of tech/prog-thrash in general. It gets the "AJFA v2" label a lot, but at least at its best, it's much more aggressive and intense and is probably among the most progressive of that kind of thrash. Absolutely destroys Victims of Deception, Time Does Not Heal, etc at least. Some breakdowns and hardcore shouting parts that actually sound prototypical of legitimate math-whatever music. I generally consider Confessor to be the forgotten pioneers of that kind of metal, but I think that with CC they could have very well evolved to their later sound without them.