My experience with Turn-Key has been nothing but negative, but it has more to do with the company than the actual business model. Usually you will be paying top dollar or even more than the property is worth at the time of purchase. So there will be no equity forced or built-in at the time of acquisition. You make your money when you buy.
To learn more on this, I would buy David Greene's book called Long-Distance Real Estate Investing and jump to chapter 8 before making a final decision on purchasing a turn-key property. I am reading the book now and it's really good.
I too bought my turn-key properties early in my investing career and thought it would be a good idea to get my feet a little wetter. Looking back, that was the wrong decision in my case. For one, you have more control and the ability to be more agile by not going the turn-key route. All though, if you're a high earner it may be a good way to be completely hands-off, and you will at least get the benefits of the tax write off when they are negative cash flow. I still think there are better options though.