Listen to your wife
My cartos last me a couple hours. But yeah, you have to be careful about filling them or they do spit at you. Last night while using the Darwin and testing out setting, apparently I put it a bit too high and had a carto spit a very HOT splatter on to my tongue- OUCH!!! I quickly turned the power down. My tongue still has a burnt/numb spot on it LOL
Drew recommended some Jumbo KR808 cartos to me to use with the Darwin (along with an adapter). He said they hold a bit more juice. So I ordered a pack of those and the adapter yesterday to try them out since I trust Drew's opinion. I'll let everyone know my impressions when I get them in and test them out.