Pros
There are great benefits. There are different shift options available so that if you don't want to do the standard 9-5, you can pick and choose your shift. Expectations are generally pretty low for the first six months while you get your feet under you.
Cons
There are a lot of unknown "known issues". Information is coveted and it takes a lot to get information for upper support staff and management. First tier support are considered to be technical support, but 90% lack the training to be anything more than product support. A perfect example is when a customer says the word "Mac". Even if the issue has nothing to actually do with the Mac itself, calls will be transferred. Finally, expect to act as tech support for grandma and grandpa. Most customers have little to no experience with a computer and many litteraly are grandparents. If you don't like supporting senior citizens, this isn't the job for you.