I have a lot of stuff from IKEA. Cheap and non-durable describes it best. It's not going to last forever. Best for college students, young people without the cash outfront to splurge on solid wood furniture, and so on. Most should pieces should last about 5 years... by then, the veneers will be all scratched, wood will be warped, etc. Your tastes will have changed, and you'll likely want to upgrade. If your furniture is still in good condition, don't just throw it out... move it to a basement, spare bedroom, or give it to goodwill. The resale value of IKEA stuff is pretty decent as well, because of the namebrand, and college students love it.
The worst part is the fucking "Cult of IKEA". Those who consider it to be the ONLY furniture store to shop at, and load their house up with it so much you can't walk a step without tripping over the latest IKEA creation. They have boxes for their boxes, that they put in their organizing shelf, and everything must match perfectly. IKEA generally rips off much more expensive, and well made solid wood Scandinavian designs. The Poang chair is a ripoff of a $500 similar looking model made in Finland by some company that the name escapes me. The name has now become synonymous with Scandinavian design. If you're really interested in light, bright colours, whites, modern designs... you can get some very pricy quality shit from Scandinavia, but likely everybody who comes over to your house will say "oh, cool... your place looks like an IKEA catalogue".