This is a great question and one many guys should fully understand because
1) Intra workout carbs/proteins can be EXTREMELY beneficial
2) There are so many intra workouts out there that appear do the same thing and yield the same results but in truth they are worlds apart...
So first pre workout/intra workout carb I ever had was Dextrose and although it is known to absorb extremely fast into the small intestine it has a high osmolality, which delays gastric emptying into small intestine where the carb is actually absorbed. And like a BB in a buffet line, it blocks anything else (in this case Protein or BCAA!!) trying to make its way to the muscle.. Then once it gets through its dumbed all at once which can cause fat gain.... Also a huge surge of glucose causes for a huge supply of insulin and Insulin takes its job very seriously so you can ( I have many time) even experience hypoglycemia (low blood sugar) after having 50-100 grams of carbs, sounds crazy I know!
Now HBCD (found in Plazma) passes through the stomach very rapidly, providing a quick but also sustained release of glucose into the blood stream. Unlike Dextrose in has a low osmolalty. Its all relative to their molecular weight I know this sounds like a different language but to give you an idea of the difference... Dextrose has a MW of 180 where as HBCD has a MW of 16,000 !!
There have been studies on athletic performance with HBCD, but forget all that. I will tell you what I noticed.
With Plazma I noticed a considerable increase in pump! I'm not taking about a feeling or some placebo BS, I noticed it in the mirror and so did everyone around me! But what was really appealing to me is my all out max intensity lasted longer.... You may workout for hours and hours but your max strength only lasts a given time (certain number of sets and reps depending on the athlete)... I was stronger for longer is what I'm trying to say...
P.S. I'm not sponsored by any supplement company or receive any endorsements lol, just my experience and 2 cents over 20 years of trial and error.
(although not mentioned, Ive tried every single carb supplement on the market)