CM has been studied well and i agree everyone should start with that.
i just finished a jar and it was a GI challenge even if i took it perfectly: (for me, no more than) 3g (and always) on an empty stomach with grape juice.
i've since decided to switched to CL's 5g chelated creatine with Waterbury's recipe for post workout nutrition: whey shake and raisins. no GI problems so i am very happy. sure, if your gut can handle mono, jump in, but if you have problems and don't want to abandon the supp then there are necessary improvements to consider