MSI's motherboards have come along way since they were producing some of the more budget-end boards back when Socket A was the big thing. While functional, they lacked features and the design placement of the connectors on some of the boards was simply atrocious.
Today MSI's game has picked up, producing some of the most impressive boards we have seen. The Platinium boards are really impressing us, and today the Diamond has managed to become another high quality contender with just about every feature you're going to want.
Crossfire support using the x16/x4 setup may be slower than the twin x16's of the X38/X48 family or the Dual x8's on the ASUS Blitz, but the added sound card and VoIP card make up for it quite readily.
Overall, MSI has a fantastic product here; with a superior phase voltage regulator system we may have seen higher clock speeds, but what we ended up with was enough to keep us happy.