One of the biggest negative points that I found was that the traffic light cut off points are way off. So it shows a green light from 0-35 μg/m³ whereas the WHO defines the annual limit now at less than 5 μg/m³.
Unfortunately in this new model this seems still to be the case and has not been improved (according to the manual [2]). So the VINDSTYRKA still gives misleading indications through the traffic light but at least you can now see the μg/m³ on the display and make a more informed judgement (compared to the old model without display).
It is difficult to make a judgement on the accuracy without really running it through a test cycle but it is definitely missing a CO2 sensor. Measuring CO2 indoors is most likely the most important parameter, especially if you live outside strongly polluted areas e.g. in Asia.
CO2 sensors that give good accuracy are relatively expensive and I believe it was probably shelved because of costs which is a pity. So this looks like a big missed opportunity but I will try and source one of these and write a review.
If you are interested for a DIY kit with high quality sensors, check out our AirGradient kits [3].
[1] https://www.airgradient.com/open-airgradient/blog/ikea-vindr...
[2] https://www.ikea.com/cz/cs/manuals/vindstyrka-senzor-kvality...