Ikea Eket shelves with a large vinyl collection?

Quite right, Elizabeth. When I checked out the EKET and the Kallax at my IKEA, I saw the EKET had a back panel, the Kallax not. I pushed on the side of a 16-cube (4 X 4) Kallax, and it moved---a lot. When I assembled my EKET's, they "gave" a little when pushed (not nearly as much as the kallax), but were very structurally stiff after the back panel was slid into place. It locked the whole structure together.

Fwiw, I decided on the Kalax, 2 units of 4 cubes, stacked and connected via barrel bolts. I could not be happier with them and plan on adding a backing panel for additional stiffness.  But that has time and is not a priority. I did add some felt pads to the bottom unit to facilitate ease of moving as required from time to time.

I have to admit I never even gave Ikea a thought for record storage.
I got my shelves from Amazon, will have to see who they were made by, but each unit consists of a 4 compartment cube at approx $60. No back but the outer wood is an inch and half thick so it ain't moving! The no back annoyed me for albums going too far back so I just added some flat wood " bars" to the backs( 2 on each shelf) which stopped them all in same depth. I feel the house will fall down before these will.

Last week I saw my ikea was having a sale .My kind Chinese neighbor took me down in his truck and I bought a 16 cube Kallet for the grand price of 78$ + tax.
My kind Chinese neighbor and his son are very handy and put it together in a half-hour and wouldn’t take a dime .
Satin black looks elegant on my wall space and REALLY helps in my small condo !

Yep schubert, the Kallax is the best deal around for LP storage. Now I'm looking for an old file cabinet for my 7" 45's. I have my collection of around 750-800 in the cardboard boxes offered by Bags Unlimited, but they're not so user friendly.