Thinking about ordering this case but I worry about things like someone spilling water onto it. Not likely, but it happens. The water would run straight into the case, on the motherboard and everything else. A sealed top would have a little more time before the water reaches anything major don't you think?
Have a couple of a similar design with large cooling fans/grills on the top, has never been an issue. But I don't use my hardware as an end-table either. The units aren't on the floor so it's extremely unlikely something like that would happen regardless, if they were on the floor I'd probably be a bit more concerned though.
I'm personally a fan of this design, where you can place a fan(s) on the top. This allows for hot air to escape the case from the top. The simplest solution is put the case on top of your desk, and that would minimize accidents. Or just strategically place it where it's less accident prone.
Thanks for all the replies. I ended up keeping my current case for now because I decided to wait until I build a brand new machine. This way I can save time by not having to move anything from the old case to new. But I will buy one with open fan grills on the top since spilled liquids shouldn't be a problem.