I got 2 HH357's in rotation on a grande and a mini 3 are 2.5ohm and 1 is 3.0ohm all have been holding up pretty well. They have been getting a little finicky though especially on the mini at 6v so I just recently switched back to my 3.0ohm boge cartos on it and I will say I still love my cartos for ease of use and maybe the flavor is a little less but they're a whole lot easier IMO