I have one PS this small, but unless you have a lot of hubs with say only 8 strings or less on them ... this supply would be too small for most of my hubs.
As mentioned, in a more distributed show ... you'd have maybe more SS Hubs and smaller PS units like these on each of them.
To me, most of mine are 550 or 650 with maybe some 500 and 450 thrown in for smaller spots. These lower powered units are much cheaper but you end up buying more hubs, so it kind of equals out a bit.