Do you have proof that Erjang is better than Erland/BEAM with real-world benchmarks? Far as libraries, I'd agree with you that there's more. The quality part varies per library.

Indeed, they have good marketing :). Don't get me wrong, I think Azul and its C4 GC is very nice. However, beyond some absolute best case on smallish heaps, I do not see it hitting guaranteed 20 micros on large server heaps. Also, Azul sacrifices some throughput in favor of minimizing GC latency, which is fine as most things need tradeoffs but should be mentioned (G1 also has lower throughput than parallel due to heavier write barriers).