First of all; Do NOT
get this pack unless it's at discount, because it will NEVER
repay. A LOT
better option is standalone 20.000 energy pack, because items in this pack are worth 10.250 energy (excluding armors, because it's only cosmetic and heat amplifier which nobody will buy at full price of 5.000 energy and heat is worthless since theres forge in game. Even if counting amplifier it's worth only 15.250 energy, but still you cannot choose what are you buying for that price. Seriously, pick 20k energy pack).
But if bought at discount (preferably -75%, so you get it for around 10€ [but this probably won't happen again, so max is -50%]) it's very good pack, as well very good deal;
-Costumes are solid and are looking very cool (especially with well picked accessories) and actually make you look knight-y, like an actual warrior, not clown-like most box-costumes do.
-Raw energy amount is OK, even if you won't sell anything else. You can get few 5* items for it. It's enough to get though all Halls of Heroes. If you will buy it at -75% discount, then you are paying less
than for 7500 energy pack and you get additional items too.
-Sparks of Life (previously Mist tanks) are delivered unbound, even if description says otherwise, so you can use it or just sell them.
-Heat amplifier is pretty worthless, because it's insanely hard to sell it at price of Supply Depot. Although it might be helpful for newbies, I guess. Just forget about selling it for some high price.
-4 Silver keys may make you return of 2k-2m crowns or you may just sell it for okay money to be sure, because it's gambling. Choice is yours.
All of those items can be obtained without using real money, except costume armors.
Overall pack is OK, but again: horribly overpriced at full price. Good thing that it is always discounted at bigger Steam sales.