Is acceleration worth it?

Who actually uses the acceleration? Because I feel it’s pretty bad,just got boss (he’s lvl5) it costs 200 coffee to upgrade him to lvl8 and you still have to pay the XP.I just prefer saving for packs.

You do get more cards per coffee than you would from a pack, so it is useful for a few whales out there that already have a metric ton of exp. Its also good for focussing on specific new units that you wanna try out cause a lot of people complained that youd get a new unit from an offer and then be unable to play it. Id definitely prefer packs myself cause i like getting new stuff, but it has its uses

I want to accelerate my Attractor, Ogre, and Yeti, but I don’t know if I need to get so much coffee. Also, I don’t know if any of them are good.