Here's mine in the corner of my garage.
I cleaned out 3 storage units/and the entire office at Global, after 10 years of banker's boxes full of files sitting on them and being taken on and off, the mdf/steel ones were all rickety while the more heavy duty all steel ones were still going strong.
But like brett said im sure they are fine for a couple of years.
For a $75 shelf I figured I could make decent shelves when it becomes necessary.
nice BDR, that's exactly what I want to build, but twice as long
the last little shelving unit I built like that I definitely built the bottom shelf too low, I think next time I am going to go for 2 inches taller than a 5-gal bucket
Water damage. I used to have my ammo stash sitting on the floor of my mom's water heater closet at her house (its the entire area under a staircase so there's plenty of room). It has a bare concrete floor but after a year or so I noticed that the boxes of my bottom layer of ammo were sticking to the floor like they had gotten wet, but as far as I know there hadnt been any standing water down there. I guess it was just condensation or something but since I elevate the ammo off the floor and onto shelves it hasnt been a problem since.
On the 8th day god created the Super Swamper TSL and said "go forth and kick ass"
I guess it just depends on what you're using the shelves for. In my case it didn't make sense since all I'm storing is car parts/junk.
I had the same thing happen with ammo once, though it didn't help it was next to the wall for the water heater.
BDR
I have one of the metal / particle board shelves from Lowes that works good. For the heavy / large items I have shelves made out of 1 1/2" gal. pipe. with 3/4" plywood (gift from El Paso).
'50 F-1 (some day might be a 4x4)
'10 Expedition EL
'09 F150 Supercrew