What is being a pen tester really like?

Hi Guys,

I am currently a Java developer but I'm seriously thinking of changing paths to 
a career in security and pen testing. 
What I would like to know is what is being a pen tester really like? I 
understand the functions a pen tester performs, but I would really love to hear 
what it is actually like on a day-to-day basis, on the coal face so to speak. 
What are the good things about the job, and what are the bad? 

Your experiences/advice would be hugely appreciated. 

Thanks,
Rahul

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