Finally, I search for 2 years for a replacement for my SteelSeries Siberia V1 Full Size Headset (due to the second-worst microphone ever, risked it, and found one.
V2 is smaller than V1.
V2 seems to have equal or better sound quality than V1.
V2 has a microphone which is PRACTICALLY Placed and WORKS VERY VERY WELL - unlike V1's, which detects dogs barking outside 100m away, better than your own voice 20cm away.
V1 however had a better fit for me (with headset size), V2 however is very slightly more comfortable (both I can wear for a full 18 hrs with discomfort only appearing between the 14th and 18th hr).
If you want a quality PC headset, BUY THIS. If you want an improvement on V1, well.. BUY THIS!