nobody has given a review? wow. if people never hit this club they're missing out. i was so dead set on buying the si3 380 but then a twist of fate put the 580xd in my hands. no complaints, but if i had to switch drivers tommorrow it'd be an si3. it's got good feel, is long, and most importantly is dead accurate. they've got a ton of these clubs for sale at 3balls.com for cheap.
I have one of these Drivers 9* Regular, changed from a Taylor Made R360 Stiff. I liked my R360 but was not very consistant, after changing to the Ping much straighter and can almost guarentee a slight draw. Not as long as my R360 but in the fairway is better.
I have hit the 8 degree 380cc for a while now. Love the club! Great feel and very accurate. I hit my Callaway 454 a bit further, but like the feel of the Si380 better. Hit more fairways with the Ping...accuracy probably aided by the higher spin rate (vs. 454).