If you’re a perfectionist this isn’t for you in that the desks are not masterpieces of construction (initially a bit uneven where the legs meet the ground , and in some spots the spacing between glass and steel frame is too wide and uneven.  For everyone else, though, they should be fine,    Once together for a while they sit 
completely level and the unevenness of spacing between frame and glass fades into the background.   Wayfair graciously sent a replacement, but the flaws on the second were about the same as on the first. All in all -especially given how inexpensive they were - I’ll give them a thumbs up. 
And as far as functionality it’s an excellent design.  The glass surfaces keep it light and airy looking but there’s enough metal to ensure long term sturdiness.  My daughter visits often and needs a desk just large enough for an iPad and something to 
write on, and the shelf is a nice bonus in that it provides a place for her papers and tablet when not in use.