Tried to order this a couple of years ago when I ordered the trays, but it was on backorder. I forgot about it and stacked the paper trays on the top of a storage cabinet which worked well until I needed more room, that's when I remembered the rolling base. My timing was great because the base was on sale. I have 20 trays stacked on the rolling base and it work great. Sturdy metal and smooth rollers make it easy to use. I think the bas is a MUST HAVE if you use the trays.
I found this base to be very sturdy and the wheels easy to roll even on carpet. Two of the wheels have locks which worked very well. I bought 30 lipless stackable trays and found the base to easily support them. I am going to be buying another base and 20 more lipless trays to finish putting all my paper in. I love that they don't take up much room.
I read the other reviews and I decided this base was exactly what I wanted; sturdy and durable. I was not disappointed. Tray is very sturdy and so far has worked out great!