I've always found it interesting that I'd never heard of BrainQuicken until he got his fame from 4-Hour Workweek. Granted, that fact alone doesn't mean the company wasn't successful when Tim was running it, but it is curious.
IMHO, he comes across very much as a "famous for being famous" type of person and for that, I've never really liked the guy. Some of his ideas are interesting, but it's hard to take him seriously when he's practically Aleksey Vayner.
Like all business and self-helpy books, you have to take the 4HWW's subject matter as a skeptic, but there are some great nuggets in the book.
I typically detest self-help books but a small number of ideas from the book were enough to change my life: not checking email first thing in the morning; checking email at scheduled, limited times during the day; setting critical goals for each day and prioritizing them; and setting short limits on the amount of time I set aside for particular tasks.
I don't really care what criticism anyone might want to level at 4HWW (and I'm sure there's plenty), but for me, these simple ideas increased my work enjoyment and productivity tenfold.
Even to the extent that any of his claims are true, didn't his mother ever teach him that it's impolite to brag?
So, while it might work for him, I want nothing to do with it. Made the mistake of reading his book and felt dirty for it.
Sure he's rich now, but he graduated from Princeton and self-admittedly worked 7 days a week in order to get his dietary supplement company BrainQuicken up and running. All this flies in the face of his 4-hour workweek book.