I've been drinking the packaged stuff for a few weeks. I really like it. The only downside is the price. About $1.30 or so for a small container and about $5 for a liter. I'll look for the raw coconuts if they're in season.
Apparently this product has been big in South America for some time and is just now catching on in the US. More potassium per serving than a banana and no high fructose corn syrup.
Oh, and I've put back a liter per day on workout days and no GI issues.