I like having two, I can have different
juice loaded in each or different
devices for different uses, and if one does have to go home for repairs I still have my favorite mod to use.
I have had my blue one since October and it has been great. No problems with it at all. I just got my black blem in January and so far it has also been trouble free. I did not get the extended warranty on either, I figured a year was long enough for any problems to show up, after that it will be abuse that will kill it.
I say go for it if you have the money!