The desk installers arrived on time and finished the install well within the time window.  We were shown how to move the desk, if necessary, to avoid "damage" to ourselves and the desk (The desk is heavy).  The "bonus" was that the desk installers even carried boxes out to the garage for disposal; we especially appreciated that their work area was left just as clean as it was before the assembly began.  In addition, the utmost care was exercised while the installers were in our home.  The filing cabinet installer was also timely arrival- and assembly-wise. Both assemblies were, as far as we can see, very well done.  Though it can be argued that assembly service  is a pricey add-on, it was definitely worth it!