I worked for Deloitte in Australia and they "golden handcuffed" my MBA sponsorship too. Similar to the other respondent to your question, the firm then got into trouble (I had to switch partners 3 times in 2 years, because Partners were resigning in droves at that time!), and I got disillusioned. I finally plucked up the courage to leave but things got ugly with the golden handcuffs. I had good memories of most of my years of working there, but this episode left a very sour taste in my mouth.