I was satisfied with my purchase. I did 2 of them.
Keep in mind that you only have approximately 12% chance land a speed secondary. So RNG could be on your side or really really against you. You also have to be ok with 4 dot mods.
I get irritated enough with the constant garbage mods I get from challenges, I'm pretty sure spending cash and getting garbage would just send me over the edge!
In my opinion, they are worth it very early on as a head start before your arena enemies can farm 5 dot mods. Once you can farm 5 dot mods, they aren't worth it
Mixed results on the 10 or so I have purchased, I have landed some of my best speed secondaries. But I have struck out at least 6 of those 10 buys. Buy at your own risk
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Keep in mind that you only have approximately 12% chance land a speed secondary. So RNG could be on your side or really really against you. You also have to be ok with 4 dot mods.
That's what I have always done... I was just thinking it for speed mods, because I don't care about resistance right now.
I tried a couple, get very lucky, then got terrible results after that.
It's not worth the risk
In short, no they’re not worth it.