Cute!
In terms of durability, the tables are a bit lightweight... so I wouldn’t test them by sitting on them; feel free to, you never know... But aside from resting a cup of joe or some books on them, they don’t wiggle or seem flimsy if we put our feet up (it’s allowed in our house) so I feel they’re sturdy enough for that..
As far as aesthetics the laminate marble is done really good, even with a beveled edge— it looks like an actual piece of marble! The wood laminate top is a teensy bit dark for me (I usually go with walnut) but it’s somewhere between walnut and espresso, light enough to see the faux wood grain..
It looks good though. 
The only thing I don’t like is that you can’t move the upper table ‘completely’ on top of the lower. You can move it all around the larger one, but it only goes as close as each corner.. they almost work best resting parallel to each other.
I must say though I’m infatuated with the wood/ marble contrast...