Yes, it had a very significant impact for me.
I read it alongside 'The Millionaire next Door' Thomas J Stanley, and 'Simplify your life' by Elaine St James.
It's hard to imagine now the prevalent lack of knowledge and understanding at the time. No one to ask, no internet and virtually no information about finances. Investing was the preserve of the very wealthy (and I had no idea what S&S were anyway). Broker fees were prohibitively expensive, if you even knew how to find one.
I'd trained and entered a highly stressful professional career to escape childhood poverty. But it sucked every hour of my week away and weekends too. I was utterly miserable. At first I thought it was because I was new and still learning - perhaps next year would be better, but it never was. The book came at the perfect time for me.
The main lessons I remember from the book:
How to create a budget and live below your means; The purpose of savings (I had only viewed savings as a means of 'saving up' to buy something specific); Concept of passive income; Money as an exchange for time - or life energy.
There really wasn't any template of how to work less, simplify and live frugally, Unless you wanted to follow in the footsteps of The Good Life and grow your own food/ raise your own meat - which wasn't appealing at all.
I paid off my new mortgage in a few short years; avoided debt of all kinds, drove a modest, older but reliable car. It enabled me to define my own priorities and immune myself somewhat from consumerist pressures. I was able to reduce my working to about a day and a half a week, and eventually stop altogether when I was financially secure.
One of the things that very soon became apparent - the book's strategy of buying US Treasury Bonds wasn't an option! UK Gilts were out too. So, for building passive income it didn't work in the UK. Savings bonds seemed a good substitute until ultra low rates came along.
I quickly realised that investing was a much more profitable means of building wealth, and moved on from the book.
I suspect this approach might have since been updated?