Product review (5 stars): great product
Installed this around a 40 gallon water heater.  Took about 45 minutes, it look longer as my water heater is in a closet and the left side has very little room against the tank and the wall; so reaching and securing the bolts to the back wall took longer than I expected.  Also was careful I was going into a stud and not a gas line that may be hidden behind the wall.  Otherwise this is fairly easy to install.  Using a ratchet wrench to tighten the bolts to the wall and the securing bolts around the front made this really fast.  You likely will need to adjust the straps to fit around your tank snug.  To adjust the straps simply pull more of the metal in/out of the buckle and bend the metal strap with your hand - it doesn't take much force.  Make sure to tuck the rest of the metal strap back against itself so it is flush against the tank when you tighten everything up.  Be careful when holding the metal straps as they are quite sharp and will cut you - use gloves if you have them and/or just be a little more careful.

Great product, we are getting quite a few earthquakes here due to the gas/oil industry and their fracking.  So hopefully I will never have to test this against the 'big one' but knowing the tank is secure to the wall and won't tip off its stand and rupture a gas line is reassuring.