Thanks for the replies, this site is not too Mobil phone friendly so I have not had a chance to respond.
I think Unique lighting proved a long time ago that the proper "Landscape" or 1838 listing is not necessarily needed, but thats a separate topic. I do agree that a properly listed transformer should always be used.
My question about the buck boost was more about performance. I find that electricians regularly use buck boost because of the low cost and are widely available at electrical supply houses.