First of all, if you haven't read "Your Money or Your Life" already, just click over. That's the classic, the essential, and this is just an accessory. That's why there's 4 stars here: just to distinguish this from that. This book is for those continuing in simplicity, not getting started. If you read the negative reviews, I think you can tell that they started in the wrong place, and that some of them misunderstood "simplicity."
I am not the typical "voluntary simplicity" guy. VS is not about living on $2/day. It's about financial awareness and choices. I've thought about it, and I want to look like I spent about a thousand dollars getting dressed everyday.
But that requires choices, since I don't make $365,000 annually. Not, um, quite. That's what "simplicity" taught me. I don't need to buy an espresso machine, a blender, a dishwaher, a microwave, an MP3 player, or a car. My mobile phone is a dinosaur. I buy the cheapest coffee when my friends and I go to a coffee shop. When we go to a bar, I drink slowly, and thus less (but I buy good beer). I often buy used books, and they look better on the shelf anyway. I do my own laundry, and shine my own shoes. I work out at home rather than buy a gym membership. I eat fruit for lunch. I don't have children, and won't for a long time--the implicit trade-off: I might not live to see grandchildren. I prefer to make my dates dinner and rent a movie rather than go out. I bought my couch used, but it is far more romantic than a theater! And I am no chef, but I can whip up a tiramisu. The VS movement has certainly made me more romantic. I'd like a bigger apartment, but....
On the other hand, I have handmade Italian shoes, wool jackets, silk ties and satin sheets. I turn the heat way down in winter and wear sweaters in my house: each month I save enough to buy a first-rate pair of boxers! (No joke!) That's choices--and that's what voluntary simplicity is all about. You don't give up anything you love: but you choose what you love over what you like. (And hey, as for simplicity: a well-cared for $400 pair of shoes should last at least ten years. I have only one pair of black oxfords, and I won't buy another for many years. Hand wash those knit socks. Etc.)
Although none of my friends can tell, I'm one of these VS folks. I still put about a grand a month into savings. I do shop carefully before I buy clothing, actually taking notes with a notebook, so that I make good choices, and I buy on sale. I recently changed jobs: taking a small (about 15%) pay-cut in exchange for substantially less work (about 50%). No one questioned that, actually! At least not to my face. But anyway, it was MY choice; or rather, my CHOICE.
Everybody's at a different point in life: for some people, VS means telling their kids they can't have a Playstation, or buying generic cereal in bulk, or learning to boil macaroni rather than hitting Taco Bell, and that's a situation far different from mine. But I really believe everybody should check out this VS stuff. It certainly won't hurt.
As far as lifestyle goes: choose for yourself. You don't have to buy second-hand clothes to be a "true" VSer. This isn't asceticism. Do you love fine wine? Do you want a classic Harley? Choose what you love, and live in a way that enables you to have it. That's voluntary simplicity.