Well made, very strong, good-looking stools!
We bought 4 of these for our kitchen island.
The reason for the 4-stars is that the assembly is quite a chore, even for an old auto/truck/motorcycle mechanic like I am! 
A couple of the bolts absolutely refused to wind into the pre-installed threaded inserts in the wooden parts. The 5/16" x 20 threads-per-inch bolts would just (try to) cross-thread or just not fit into the holes at all!
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Yes, be SURE to leave ALL the bolts VERY LOOSE until the stool is COMPLETELY! assembled!
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That way, the misaligned holes are a little easier to get the bolts started into the threads!
Then go over it and tighten all the bolts properly!
You will be happy with the results of your labor!