Hi William

>I've not seen more than a few mentions of firebird over the years, but if it is solid and well supported we will look at it.

http://www.firebirdsql.org/
join the FireBird group at yahoogroups.com, and if the search reveals it you can lok for a post by a person who has an application using FireBird for a big bar, lots of points of data-entry and high transaction turnover it is a very good read of it's performance.

>Have you been using it?

Not at the level you want to use it but yes I have been using for quite sometime and am a satisfied user.