Its only gonna be a good career if its something you wanna do, if your hearts not in it and your just wanting to do it for the money then your probably not gonna enjoy it. Some of the certifications for this are extremely difficult (CEH comes to mind here). You will spend alot of your time doing penetration tests etc. Your also gonna be studying all the time, as you need to renew your certifications in this area all the time, to keep upto date on all the latest techniques.