Pros
Flexible hours, good work/life balance, eclectic coworkers, fair management, relaxed atmosphere, retirement benefits, networking opportunities within county & community, paid training, learning opportunities, potential to move upwards, advise from coworkers to guide you through library school, opportunities to take on more responsibility (with tech, making your own displays, other small projects, program suggestions, etc.)
Cons
Flexible hours (schedule is not always fixed), no choice to enter retirement plan (7% per paycheck), mandatory unpaid 1hr lunch breaks for 8hr shifts, the rare but inevitable "problem" patrons, you have to do defensive driving once yearly as per the county, low pay (but decent pay for the low stress & small expectations of the role).