I bought and installed two of these. Installation was very straightforward, and I would just offer a few suggestions.

When attaching the horizontal cross bar to the bottom of the vertical supports, I would reverse the position of the bolt - instead of having the head up and the nut underneath, put the head on the bottom and the nut on top. It looks more finished, and is less likely to snag something from underneath.

Second, when putting the 3 grids on top of the cross bars, pay attention to the grid orientation. I installed mine so the grid wires that run length-wise are all facing up, to achieve a consistent look, and to possibly make it easier to slide boxes across. (Actually, I didn't do this on the first one, because I wasn't thinking about it, but it occurred to me when I installed the second one. Maybe I'll go back and change the first one.)

Third, they give you 4 small bolts, nuts and washers to use to attach the three grid sections together. I ended up using 2 larger washers with each bolt, one against the head of the bolt, and one next to the nut. This lets you tighten up the bolts a bit more, with less likelihood of damaging the white powdercoat on the grids. Just don't use washers that are too big, or they will stick above the grid, making bumps in the "floor".

I think using the nails to hold the ceiling brackets in place is a matter of preference - for me, it was just as easy to mark the holes with a pencil, move the bracket out of the way to drill them, and then install the lag screws to hold the bracket in place.

If you have an impact driver, its the perfect tool to screw the lag screws in. I've used a ratcheting socket wrench in the past, and it was a lot more effort and took much longer.

I'm very satisfied with these units - they're perfect for a smaller garage, and go up pretty easily if you're moderately handy. The white color has a cleaner look than the previous hammertone gray.

Bit hard to install due to a shortage of parts. Got it installed in the end.

The hardest part of the installation was locating the studs. My ceiling has 2 sheets of drywall making the stud sensor useless. I ended up drilling a bunch of tiny holes to locate the studs. Also the lag screws and the test nails are a little short for ceiling with 2-sheet drywall. I had to purchase longer ones at Home Depot.

This product is very well made (sturdy), and it is so useful that I wish I had purchesed one years ago..It is powder coated white, and it will hold the 250 lbs of items that the box states. I am not the best with hand tools so it took me longer than the one hour to install on the ceiling but the benefits were worth it....get all that stuff off the floor of the garage and put it overhead out of the way. I have installed two of these units and will probably buy one or two more. Wait for free shipping,the 45 by 45 inch unit is a good all round size. Very useful item and I am very happy with them.

This company has an excellent product. The shelves are made of high grade steel and are solid. The packaging of the hardware is well labelled, and the quality control is excellent. This company even includes extra screws and bolt for those pesky run aways that might fall out of your hand while up on the ladder. The end product is handsome, strong, and holds a great deal of stuff. The company even offers a an excellent tutorial video on line which shows the installation in a step by step manner.