H2 database

Hello and best wishes for this new year.
I have a question concerning the H2 DB.
http://www.h2database.com/html/main.html
I've read (on their site) that they got better perfs than PG or MySQL in
any case (embedded in a Java application and even as a standalone server).
Tests seem a bit "light" with a single thread benchmarking the DB but
the results seem anyway interesting.

However I would be happy to get experts opinion or advice.

Thanks in advance

Pascal