I got it from American Soda. Its basically a powder you mix with water. I dont drink a lot of robinsons, so Im probably not an expert at making a comparison, but I would say that Kool-Aid is very nice. Has a clean fruity taste and the powder mixes well with no nasty floaty bits.
Kool-Aid is absolutely great. It's expensive due to the import fees but I buy cherry koolaid to mix with Mountain Dew and it tastes ****ing awesome.