The most important feature of any camera system is the replay speed options, and the clarity of the replay at speeds greater than real time.
No one ever mentions this, or has realistic demonstrations of their product doing this task. If/when you need to review footage from 6 different cameras and you don't know when the incident took place and you need to look at footage over many hours or even days, it is BRUTAL if the playback system is no good.
Some systems I've had will claim you can watch it at 4X,8X, or even 16X real time speed, but none that I've had has ever delivered a clear smooth image so that this is actually possible to watch at these speeds. Some also claim they only record when there is motion, but these are also a trap and either just continuously record anyway, or even worse, don't record the event you are actually looking for.
Also check to make sure you can get clear screen captures of paused video. Some systems look clear on playback, but as soon as you pause them their 1080p video suddenly looks like you paused a 1980s VHS player.
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