VistaDb is closing their office as its founder states here.
I was one of the many that wasn’t seduced by VistaDb. I did take it into consideration along SqlCe and SQLite for an application. Though I was impressed the most by SQLite I end up using SqlCE because of better date/time manipulation and it was integrated in Visual Studio; also because I anticipated a better implication of Microsoft in the forthcoming releases as it will be a necessary piece in the battle to occupy the mobile devices software.
At that time VistaDB had the worst stats in benchmarks, wasn’t free like the others, and it was at its infancy. So it had no chance in choosing it.
Looking now at their features (if they really work as advertised), it is an impressive piece of software that probably took a lot of development time – mostly high quality development time (building something like VistaDB this is not the same thing as dragging and dropping a few controls on the form and binding them to a data source).
And since it is closing down it can be purchased for almost nothing.
Therefore I think that there will be a buyer. And VistaDB will not Rest In Peace; at least not so soon.