Pros
This position is probably a decent start for someone in the insurance industry as long as your realize the bias required to investigative for GEICO should not be there for a true professional.
Cons
As an SIU investigator with GEICO you will not be a true professional that completes an unbiased review of the facts available and submits the investigation to the appropriate adjuster. Your goal is to work as many claims as possible and work the investigative summary is such a way that it at least appears your cursory investigation financially impacted the claim. Be prepared to work 20-27 cases/claims per month, well over the industry standard and meet the requirement of a 9 to 12 average case life. By far the two biggest complaints on a daily basis is the volume and that if there are not enough claims being referred for investigation management will request "proactive" claims be investigated to meet the monthly number quotas. While this does not sound that bad the truth is you are investigating real people and holding up legitimate claims to make number quotas. The pay is moderate though low for this position and responsibility but there is not matching 401k or generous leave time.