Castrol has been marketing the heck out of Edge that last couple months (TV ad with guy's hair blowing back when he picks up a bottle). On tha main Castrol USA website it is listed as an "Advanced Formula" lubricant, above their "Performance" category. Here is the website: http://www.castroledgeusa.com/
It claims 8X better wear protection than Mobil 1, and at least equal to Mobil 1 Extended Performance. Only 0W-20, 5W-20, 5W-30 & 10W-30 are listed for the US, however. In Europe it also comes in 0W-30, 0W-40, 0W-30 Turbo Diesel, 0W-40 Turbo Diesel and our favorite, 10W-60. The Edge US website says, "Watch out for other Castrol Edge viscosity grades coming in the future."
They are touting extended drain intervals of 15,000 miles/1 year, which is of course, what the M3 recommended change interval is.