Jody Nesbitt: yes, loads, they also have disclaimers saying they will server what they consider to be the best version of the text, so are at libertiy to overwrite what you write if they think its in the best interest
Neil Cheesman: yes.. it seems to happen quite a lot with some websites... although with my own the description is generally used
Greg Moro: Micah, I assume you mean when exact match? BH had this issue with the prelit trees page a lot...Google constantly pulled from the text at bottom of the prelit page. Currently it`s doing it when searching "pre lit christmas tree(s), " but meta has "pre lit artificial christmas trees." Google uses the meta desc. for "pre lit christmas trees" though, so it`s respecting it for exact match it seems.
Dejan Petrovic: Very common. Happens when snippet isn`t as relevant to the query as Google would like.