I've got a set of Frogg Toggs that I've had for probably close to 8 or 9 years and they're still in fine shape, but that's because I rarely wear them. Like others said above, they are not very durable. One walk through a small briar patch and they would be torn to shreds. They almost feel like a thick paper towel material to me, seriously.
That being said, they are super breathable compared to a lot of other rain gear I've worn, they pack down very small, they are SUPER lightweight and mine have never gotten a hole in them. At first they were very noisy, but I put them in the dryer with an old pair of tennis shoes for about an hour, and that softened them up quite a bit. Still they do make some noise. Basically, they make a good set of back up rain gear or the kind of stuff you would wear around camp. They would be fine for elk hunting if you plan on hunting until it rains, put on the Frogg Toggs, sit down and wait out the rain, take the Frogg Toggs off and then commence to hunting again.
I just haven't found that perfect rain gear yet, but then again I don't hunt a lot in the rain either, so no big deal.