My wife bought me a 3+ Silver for my birthday about 6 months ago.
It's the most fun and versatile video camera I've ever owned.
It takes some getting used to, not being able to quickly preview the video that you just shot (I don't have the LCD Bacpac), but it's easy to hook to the TV (via HDMI) for viewing later.
(I've found that playback on my computer is too clunky and it skips frames at higher resolutions.)
The size and durability of the GoPro inspires me to do things with it that I would never do with a traditional camcorder.
The first thing we did with it was rig an 18" mount to the back of my T-Maxx and ran it out on the front of our property.
We got some pretty good footage that day.
The case got some light scratches on the outside (from all the tumbling around), but not nearly as bad as I would have expected from the abuse it was taking.
The lens cover part of the case sustained absolutely no damage whatsoever, not even the lightest scratch, so I'm guessing it's made of some pretty durable material.
I've also used it to take slow motion video of some target shooting I did.
(I ran the camera at 120 fps and then slowed it down in editing.)
That was pretty cool too.
I would advise getting a camera case/bag and some extra batteries for it.
The box it comes in isn't any good for anything once it's opened, but I did take the plastic display tray that the camera comes mounted to and made a sort of universal-zip tie-mount. Works like a charm.
And although the battery life is good (even when in WiFi mode), you wouldn't want to have to stop shooting just because your battery gave out. Especially if your out in the middle of nowhere.
Doing anything to the camera itself like changing the battery, the SD card, or what have you can be a little of a pain since you have to take it out of the case to do those things, but once you get used to that, it's not a big deal as it's easy to do.
Because of that though, I also recommend a large capacity SD card.
The WiFi iPhone control is really great too, as it allows you to frame your shot with a little preview pane on the phone.
It also allows remote control of the camera when shooting, but does not allow remote playback once it's hooked to the TV.
(I don't know how that got overlooked)
There, I know this is a long post, but that's kind of how I roll, and I threw in everything I could think of to tell you about my experiences with my GoPro camera.
I wouldn't hesitate to get one if I were you.
It may seem pricey at first, but you'll likely forget all about that once you start playing with it.