You know how it is... one person says something, and then it gets repeated, and pretty soon it has lost its original meaning. AFAIK, the original caution was for 1.5 ohm "LR" atties. Now, like WOH said above, 2.0 ohm LR atties might just be OK, as would 2.5 ohm LR atties. BTW.. "standard" ohms is 3.0.
So when we say LR atties, unless we specify the ohms, who knows what it means. I've not heard of 2.0 ohm atties frying eGo units, and I have heard that some vendors ship 2.0 ohm atties with eGo type devices. OTOH, there are different manufacturers, device revisions, etc. Go figure.
I guess it is just best to have a spare unit. I'd avoid 1.5 ohms. Then again, some swear by em. The 2.0 ohm atties will work on true 3.7 volt devices whereas the 1.5's are too hot IMO.