I have good mods and cheap mods. I leave the expensive ones at home, no point in risking their loss. When out and about I'll usually take a cheap boxmod or two. If I lose one I'm only out about $10. I also believe in backups. I've had stuff fail in the past and I don't want to be left vaporless.
I also bought a vv boxmod, mostly to use up atty's that just don't have quite the right resistance for use on my other rigs. Some will taste burned at the 4.2v that mod batts come off the charger at. Others are just a bit too high and don't give the throat hit and vapor that they should at that voltage. With vv just turn it up a bit, or down, until it hits just right.
I also bought a vv boxmod, mostly to use up atty's that just don't have quite the right resistance for use on my other rigs. Some will taste burned at the 4.2v that mod batts come off the charger at. Others are just a bit too high and don't give the throat hit and vapor that they should at that voltage. With vv just turn it up a bit, or down, until it hits just right.