I made the mistake of going to Silver at the end of the hiring spree in mid 2012. Hold a line in Florida in 2-3 months I was told. Upgrade in a year I was told. The only place I could hold a line was in Mississippi- even there I got bumped to RSV after 4-5 months of holding a line by people pref bidding in. The problem is the lack of seniority list movement and the DEC's that were hired. The only ones upgrading in the near future will be the senior FO's. If you go to Silver be prepared to sit right seat in the S-A-A-B for years and always be in danger of losing your line (if you stay long enough to hold one). I'm so glad I left. What a terrible first 121 experience.