Pros
They really don't care if you have skills or not, they just want bodies that show up. You don't even have to show up on time, they'll still let you work. If you're a smooth fast talker, they'll believe any excuse you tell them.
Cons
Work is sporatic at best. When there is work it's 12 hour shifts with two 15 minute breaks and a half hour lunch. They make you wear steel toes even though you just stand in one place the whole time. They don't care if you have skills to do a certain job, you will do the job that takes no skills. there is no advancement, you will not get hired on the the company. The only time you see the Adecco supervixor is for 5 minutes per day when he comes areound to tell everyone what time to show up if there is work the next day. You may show up for work and be told that you were laid off by the supervisor of the compnay you are assigned to.