From my perspective, the only con is the lack of matching 401K. There are, however, other things you should know if you're consider working at IA:
1. If you like structure, a clear path to advancement, or regular HR Performance Reviews -- you won't find that here.
2. If you're comfortable clocking in and out at specific times each day -- you won't find that here.
3. If you like having a cubicle of your very own to decorate with kid/cat photos -- you won't find that here.