Complex SSIS packages are more likely to increase maintenance cost than decrease it, because there are far more places to look for functionality, and more scope for introducing errors. A stored procedure has almost all of its' functionality in front of you. Whoever suggested this should be done to improve performance should be politely requested to explain why, as it isn't at all straightforward. I'll stick my neck out and suggest that unless you are importing from heterogenous data sources, or writing to them, an SSIS package is unlikely to perform faster than a stored procedure at the same task. And that's without mentioning bcp.