I've used these several times to support plywood while cutting. With a bit of wiggling them around I can get a quite stable platform on my not-so-level driveway. My only complaints thus far are that the trays (and thus the legs) don't lock or snap into the open position which isn't a problem when the horse is supporting weight but means the legs tend to close a bit when moving them around by themselves. Also, one of the tabs on the tray snapped off the first time I used it, but this doesn't affect its function. For the money, this is a great product.
I purchased these for my husband. My son-in-law owns the same item and my husband had expressed a desire for them. Anyway, they are very sturdy, which is of great importance to him. Also, he says that the tray & cord holders are very handy. He is working on a 1951 Chevy pickup and I cleaned up the transmission while it was sitting on a piece of plywood situated on the sawhorses. No need to worry about the sawhorses moving and buckling under the weight. They are great.
I have used the saw horse(s) several times. It has been quite stable even when pushing the object across them. The handy tray underneath is excellent. I usually put whatever Iam using somewhere & cant find it or step on it & break it. Now I know where to look for it.