I had RaxMasters install a 4x6 and a 4x8 overhead storage units in my garage. I selected them because descriptions highlighted the quality of the product and other reviews of RaxMasters were so good.
I'm very pleased with the units and with the service. Installer Jorge was on-time (actually a bit early), and very efficient with the installation. The units feel quite sturdy. Inspired by one of the photos on their website I even tried the "Can I hang from it?" test. They were both solid - and I'm quite a bit bigger than Jorge is.
Although I got enough storage for most of my needs with this, I may add some more. There are a lot of look-alike houses in my neighborhood - having all that extra storage could be one differentiator should I ever decide to sell the house.
ADDED LATER: I did add some more, 4x8 and 4x4. That let me get a couple more items out of the house, and it gives me plenty of storage space for the years ahead.
And if I ever do put the house on the market I'll be able to advertise that it has more than 100 square foot of overhead storage, something that most of my look-alike neighbors lack.