Yep, I think that's spot on TxTumbleweed that they're tailored for the mods. Work pretty well on my stock Riva lite too. I'm doing a side by side comparison with the 3.5 and a Boge 510lr. So far, the overall hit from the Boge is just a wee-bit better than the 3.5s. This could be the juice being different in each one. I'll just top each one off every night and see how they compare over the long haul. I've found that I carry around a gogo and a Riva. I'm experimenting with good cartos for the riva. Got the Boges, the 3.5 and the dual coils are on the way. Overall the boges on the riva have proven the best for overall hit for me.