I've been ultra concerned since getting my Epic(~2 months). Because I work construction, specifically an industrial/heavy commercial electrician. So far the site I've been on, is heavy industrial. The site I came from was underground, which meant I constantly got dirt into my pockets.
This means it goes in my carhartt pockets through out the day. My main concerns with phones has always been 1-the glass, 2-the slider and hard buttons(or any physical movements), 3-and open ports. Because it will experience a myriad sp? of conditions; dirt in pockets, metal shavings and shards, drops and falls, physical abuse(leaning against a rail rail, having something over the leg), I think you get the idea.
I came from having the HTC Hero. Which I had actually just started to like ater a year, only because I finally took the leap and rooted it. The screen was good, but after giving up on trying to use screen protectors, it was covered with hairline scratches. I liked it because of the minimal moving parts. Surprisingly I never had a problem with the track ball. But as an annoyance I did get dirt/grime built up in the cracks around the four main buttons, and I regularly took the back cover off to clean all the dirt out. And had issues with the charge and headphone port getting debris into them, which prevented plugging in.
With my Epic, I meant to get a screen protector asap. But it's never happened. And even after pulling my phone out a few times, feeling it rolling around in my pocket with metal shavings. And although it has scratches on the back, surprisingly the screen has no scratches, even hairline scratches. The slider I think is just as springy, and smooth as when I got it. The buttons haven't got any junk in them, in part because they're protected except when using them. And the charge port is as clean as when I got it, thanks to the cover. And have checked the battery compartmentbut have not had any real dirt issues. All in all, I love it. My only suggestion, is I'd like a plug for the headphone jack, but nobody offers that.