Product review (5 stars): The Lambro's great. The Heartland is great. You won't go wrong with either one.
I bought both the Heartland and Lambro products. They are virtually the same. I didn't see any weaknesses in either one, and I would be happy to have either installed at my home. The Lambro arrived first so it got the nod. It installed relatively easily. The most difficult aspect was working around the unevenness of the overlapping clapboard on my house. I would have had the same issue with the Heartland. I managed to slip the top lip of the Lambro under a course of clapboard and that lined up the bottom of the vent fairly well with the 4-inch exhaust hole in the house. I cut away the clapboard under the base of the Lambro in an attempt to make the vent as level as possible on the uneven surface. In the end, it tilted very slightly toward the house at the top. I've checked a few times with the dryer both on and off to make sure that it's working properly -- and it is. The most important attribute to me is that this device does not clog. It sheds a little lint on the ground beneath it, but I'd rather have it there than fouling up the exhaust line somewhere. And, of course the damper closes automatically when the dryer is not in use. Given the sub-0 temperatures we've been experiencing lately in the Northeast, that's a welcome functionality. On a cold day, I can still feel a very slight draft in the laundry area, but it's a night and day difference and improvement over the draft we got with our previous dryer vent.