Auto Fill and Auto Drain are usually listed as two separate options from builders. Get them both, don't even think twice. My first two pools didn't have either, my new pool here does. Without the auto drain, your pool will overflow during a big rain... and this can damage the coping.
The auto fill works great when it's really hot out and we're not getting rain - you lose a lot of water to evaporation every day. If the auto fill fails (rare, but can happen), you'll get a higher water bill than normal, you fix it and you're OK - again it's extremely rare for it to fail in an open position. The cost isn't that much. Filling my entire pool only cost about $20.
The peace of mind you get is awesome. I remember having to pull a hose to my pool in GA at least twice a week just to add water. Then you have to babysit the hose to make sure you don't overfill.
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