Pros
As a laboratory technician working primarily in sample preparation, or an analyst working primarily in analysis, you will master the techniques required to generate good, quality data. You will learn how to calibrate, maintain, and operate expensive scientific instruments. If you pay attention, you will learn a great deal of industry specific knowledge. All of these things are huge Pros.
Cons
The experiences and skills mentioned above are probably worth more on a resume than the actual money you will make while working here. This results in a relatively high job turnover rate; periodic vacancies tend to perturb the web of shared duties in the laboratory, interrupting work-flow and raising overall stress levels.