the build quality of this product is a 5, specially considering the price point.how well does it work? I would say, its finiky. i.e u have to really spend time to get the door height just right before u will let it server as your extra hand, very time consuming.but it works as advertised.but here is a risk of it moving.I agree with another reviewer, ideal if you are doing 20+ boxes with the same doors, etc. then there is some real time savings, which might be the target market. It still works for a couple of doors, u just need to spend a lot of time adjusting it to get that door to be just where u want.so 3.5 stars for me overall for use. but if I was doing entire kitchens every day, I would give this 5 stars. so a lot depends on application
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