I think there is far, far too much misplaced hatred on auto batteries around here.
Automatic batteries, when they work for your needs, are simple and natural feeling for a recent smoker. The downside is that some high pressure winds or loud noises will set off certain batteries, and if they are connected to your atomizer and running for a long period of time, that could potentially burn it out. I'm a deejay, and I've found that my loudspeakers usually set my autos off, even while in my pocket.
Manual batteries are often (but NOT always!) sealed against wayward leaky liquid that can damage them. The downside is that you have to consciously think about the switch, and if you have them in your pocket, you could just as easily press that and set it off. With the exception of a few mods, most manual batteries do not have a recessed switch. I also had a faulty manual switch that seems to "have a mind of it's own", and burned out an atty.
Personally, I use both, for different environments. If your autos are working for you, don't throw them out. If you're in high wind/noise, get a manual or two to swap out.