I used the Gu brand Recover drink mix. Really liked it, was great ratio, mixed easy, one of the best tasting out there. Then they discontinued it and replaced it the Roctane recovery, which has a different ratio of Prot:Carb, tastes worse, and costs twice as much.
Really miss that, would have stocked up had I known it would simply disappear.
Still looking for something that’s a direct replacement, but have been using SiS recovery mix I had leftover from a previous trial, with some sucrose added to get to 4:1.