I do. Because I am both feeble and a poor bricklayer, i have infilled a redundant door with them. 3 years on , no cracks.
And the most recent use was to jack up the site caravan, because a dozen go on a trolley and into the car.
They are not strong.
More importantly they have little interlock. If concrete blocks crack , they have a very jagged interface on the crack, and resist displacement. Aerated blocks dont have stones so this doesn't happen, and cracks will grow.