Although not the most experienced grower, I grow mostly Oncidiinea: Brassia and lots of different Oncidium hybrids. I have two Wilsonara and they are the most finicky of all of them. I say that as they seem to burn easily and need to be watered more than other hybrids, and the two I own have been very slow growers and sturggled over the past year or more. I think this is the case as I have a relatively hot growing environment over the spring and summer.
Even for their relatively small size in comparison to the others Oncids they seem like they can survive the temp, they just don't like it. In my growing conditions they don't seem as vigorous as the Oncidiums, Mitassias and Odontobrassias. I'd have more than the two I do have if they responded better in my care. Hope this helps in some way.