Box is definitely not worth spending the gems either. useful cards from my 3000 gems were 1 senju, 1 electro, 1 ninjutsu. I could have easily just farmed 3 electro with those gems and been on my way with the actual box sets.
Also keep in mind that this doesn't give you any progress into boxes. so even if you were to take your 3k gems to a normal set and got basically nothing you would atleast have made it easier the next time around to get what you were looking for. This box is def not for f2p.
Anoymous
F1k1sk0