I have a PO Box at this location, so I'm in here pretty regularly. As far as 24 hour access to my box, or buying stamps and other services from the kiosk, it's perfectly fine.
The lines, however, move at a glacial pace. We're all used to slow lines at the post office, but this particular location seems to move more slowly than the average post office.
If you need to drop something off, there is always ample parking and easy access. I go here for kiosk services and my PO Box. If I need to go stand in line for something, I'll go to the Boulder Highway post office. That location also has long lines but it is usually better staffed and the lines move faster than they do here.