Dave... any chance you might start stocking the Boge 306 cartos?
I've tried the 510s and prefer these, though I generally prefer 306 in any case.
I use the 2.8 ohms on my 306 (for on the go) and I use the 2.0s on my ego.
Started using the 2.0s beginning of last summer and maybe go through 15 a month.
But, the suppliers I have been getting them through can't seem to keep them in stock.
Also, your prices are a bit better.