Comment by koralatov

A big downside of IKEA’s modular shelving is that they periodically release a new range and discontinue the old one. This happened to me with their ALGOT shelving system about 10 years ago. I bought mine not long before it was discontinued and replaced by BOAXEL which is not compatible.

That’s fine if you buy exactly what you want and need and know your needs will never change, but if you later want to expand, you’re out of luck. At best, you might get lucky and find parts of Facebook Marketplace or Gumtree, but you’re usually just stuck. (I’d kill for some more 200cm wall rails but I doubt I’ll ever find any.)

The 606 Vitsoe system is heinously overpriced but has the advantage of having been around for 50+ years and is so established you’ll likely always be able to buy more parts if you want to expand it.