Pros
The growth potential is good if you are willing to work hard and be patient enough to take the time to learn the "Tenaris Way" before getting promoted to the next level. Tenaris is very particular about product and employee quality, so they are insistant on people learning how Tenaris does things as opposed to the way you have done your job elsewhere. They are open to new ideas, but it can be frustrating if you have not worked in a global company before. If you are looking for integrity in a CEO, this is the place. Rocca is one of the few CEO's you can trust in todays market.
Cons
The global standards to process, manufacturing, etc can be frustrating because it can not translate to the local cultures well, making the work more buerocratic than it needs to be. The expected hours are long due to the South American work ethic. They have a lot to learn about Work/Life balance if they hope to retain good employees.