I am in month 10 of this project and I really feel it has been a good thing that I had to lose this much. I couldn't just "eat better" or "eat less", I had to actually pay close attention to what I have to do. As a result, I eat better nutritionally than I have my entire life and I have developed a very good exercise habit.
If I'd only had 25 lbs to lose, I'd have likely just "suffered through" exercise, but instead of figured out which activities I really enjoy enough to look forward to moving. I actually get cranky on the days I can't move. Never, ever thought I would be that person.
Same with eating better. If it had just been short term, I'd have just cut calories and toughed out hunger. Instead I figured out which foods would give me the most nutrition and satiety per calorie and build my meals around them.
I can't really envision me backsliding as I really, really like what I'm doing now and not just because of seeing results.
Now I do kind of wish I'd figured this all out sooner, but at age 50 I feel I'm setting myself up for really healthy older years. While other friends my age "know" they should be exercising and eating better for their health, it seems like the only ones really paying attention are those who've had to take off a considerable amount of weight.