Personally i am not a fan of consumables and never use them at all, therefore i always have a pile of 30 of each booster.
I tried using it a few times against galactus, but then found that in difficult battles, you still die with boosters, you need luck with a good cascade to win hard fights 
Gotta agree, way more annoying to get 20 
before you are 4/4 than getting any boost. Rather they fix that.
This reminds me when we could briefly get hp from standard tokens. I think cp from standard tokens would be awesome, especially for players that don’t 1*, 2*, or even 3* covers.
I understand and agree with everyone saying the 20 Iso before 4/4 is the real issue. However, the Devs are already aware of this and hopefully one day they figure out how to fix it.
The point of this discussion is to bring forth the uselessness of the Critical Boosts as one of the 4/4 rewards… nothing is worse than finally earning a reward from the 1/4 only to be Critical Boosts. So basically as it stands now, 28% of the players are fine winning a Critical Boost over something else such as CP.
I bet there’s a lot more threads about getting 20 iso 5 and 6 times when the cp is still in there in a few days.