I've used one, and as you know these DCs are inconsistent from batch to batch and even carto to carto in the same box so YMMV. I used my 2ohm DC on 4.9V Provari and that was the butterzone for me until it clogged or oversaturated, I forget which.
So it would be great with MV 5V box mod. I've also got a 2.5ohm that works at 5.5-5.6V best and the 3 ohm I tried worked at 6+ best... so yeah...the LiFePO4s again

But it was satisfactory at 6V on the Provari (which holds its voltage under load) or 2 AW 3.7 18350s stacked, which at first was a little too hot but when drained a bit was about 6-6.5V under load so that was about perfect.
Hope this helps.