In my particular case, doing what I consider about 30% work efficiency:
I have good references from people in this company (been there 4 months). They are all happy with me, probabaly because my attitude is good and my work is good. I'm not going as fast as I could but honestly they don't know how fast I can go, and I do work fast when I do work...so they don't know any better, hence the better reference. True, it is a bit lazy, and I am in fact ambitious but in my current state in the company (1 of 2 technical people) there is little room for advancement until the company grows, and so at this time I'm doing quite well.
Add to this the fact that I've only had about a year to clear away a life of total and absolute laziness and procrastination; I think I'm doing ok...I'm getting there, just need more time - I burn out quickly!
I am also aware that the IT field could possibly get swamped with skilled workers in the future and I'm always trying to keep a tally on how I can maintain a secure skill so that I don't find myself out of work or undermined by people willing to work for much less !