Um ...? WTF does "well polished" mean?
As far as I can tell, iSCSI works just fine. We're using it with ESXi but that shouldn't really be any different than ESX IIRC. There's a gotcha if you try to configure multiple initiators. Use "ALL" when doing that. Other than that, while we're not yet using it for anything serious, all our testing has been problem-free so far.