Yesterday I took delivery of a pair of dedicated stands for my P3ES2s. Something Solid XF open-frame stands replaced a pair of cheap no-name stands brought to height with a couple of pint glasses (!). Two pics are attached showing the Harbeths in my front room.
Structurally they could not be more different. The no-names are unspiked, hollow, unfilled, ringy, unstable and couple the speakers at the centre. The XFs are spiked, made from solid bar, inert, rigid and couple the speakers at the four corners. There are similarities: both couple the speakers using blu-tack, neither features a top-plate and most importantly, both place the speakers at the same position and height.
Now, I will be the last to claim my comparison was a valid double-blind test; this really isn't possible in a domestic setting. I compared the two using recordings with which I am very familiar. Sonically, the two are indistinguishable to my ears. (This isn't to claim that the sound really is identical, only to say that I couldn't tell them apart given the testing limitations).
This wasn't as surprising as it might have been, as I had read Harbeth's take on stands first, which can be found here.