I did my first dozen deals in my own name. Never meant to do that many without an LLC but just kept putting it off. I eventually used LegalZoom.com to form my LLC. Would use them again.
There is definitely more exposure to your personal assets such as your home, I would always suggest doing flips in an LLC. The only hassle is that your have to present a Certificate in Good Standing for your LLC every time you send out offers. It costs about $30 on your states website to download a current copy. I end up buying one about every 2 months or the REO banks freak out.
You just never know what might happen after you sell the house. It could be dry and sunny for the 3 months you own the property and a month after you sell it to a new homeowner it could flood the basement due to heavy rains. You never know what comes back to you.
As a side note, I always offer a home warranty when selling. I think its a good selling feature, plus it potentially takes future issues off of my back as the new homeowner will just contact the home warranty company instead of potentially contacting me. all for about $425.