The benefit that whey isolate has to offer, is that it represents the best compromise of value and efficiency.

What is Whey Isolate? Whey isolate undergoes the same processing as whey concentrate, but is passed through additional filtering processes...

As both casein and whey are proteins from milk, there is a chance that whey protein isolate could include trace levels of casein, though it's unlikely.

Most whey isolates contain little or no lactose content due to the filtering process they undergo during manufacture.

Raw whey protein powder has a slightly chalky taste with a hint of cheese and milk.

Yes, whey isolate is a rapid digesting protein source with little to no lactose to effect those with lactose intolerance.