The chairs look great but they're pretty cheaply made. Specifically, the black metal that the chair molds mount to are not very firmly attached to the dowels and, furthermore, are actually prone to bending if the chair is sat in too forcefully at the very edge (or, I assume, if someone heavier sits in the chair). Also, the bolts which affix the base to the chair mold seem to be too long for the sockets, resulting in a very unsettling noise whenever sat in (see tip at the bottom). Tightening the bolts only reveals how easily they strip.
So, why 4 stars? Well, because they're cheap (you're getting what you pay for) and they look great. Plus, once I tried the tip below, they actually work alright.
GOOD TIP: Keep the 8 felt pads that are on the bottom of the chair molds when you take them out of the box (they're used for shipping and usually meant to be discarded). In fact, keep them exactly where they're placed--over the bolt sockets. Cut holes in the felt pads so that you can screw the bolts through the pads and into the sockets. Now, with the pads still there, screw everything in as follows: bolt, washer, black-metal-base, felt pad, white-chair-mold-socket (for lack of better terms). Leaving the felt in place does two things: (1) it adds more height to the bolt sockets (which are deficiently shallow), and (2) provides a squishy layer to stop the metal from rubbing against the plastic whenever someone sits on it, and thus eliminating the terrible noises.