Over the last 3 years, I have purchased four of these for my terrace to use for a bonsai collection and have been very happy with them.  They work very well on my covered terrace which gets full sun and some rain.  The older ones are holding up nicely.  If yours are in an unprotected space or in tough weather, you may need to periodly clear coat them.  
These are easy to assemble and take just a few minutes though I do recommend a power screw driver if you are putting together more than one.
Also, I have used two of them to make a unit of five (plus a unit of one for supplies) which fits perfectly in my space.