I bought a used ARE for my tundra. It took over a year to find one, and then I took it to a local body shop for paint match. I looked at new, but the idea of spending 4K on a fiberglass topper made my toes curl. I have $1,400 in my used one, after paint match.
I built a pullout drawer with a sleeping platform for my "truck caper," and my wife made curtains. It allows me to pull my boat and camp in relative comfort. My little 5.5' bed sucks but it's better than the tent camping I was doing prior.
I don't know how old my ARE is, but it leaks everywhere. It leaks from the lower corners of the front and side windows as well as from the rear hatch. I've tried a few things to stop the leaking, including throughly cleaning and replacing some of the weather striping. It still leaks a little.
Out of frustration, I called the local ARE dealer and they wanted $125.00 an hour, with a 3hr minimum, plus material, to reseal all the windows. They told me there was no guarantees they would could completely seal the topper and some leaking is to always be expected.
When it's not raining, it works great.