is postgresql 8 is realy mature

Hi list!
We are using currently postgresql 7.3.4 havily and planning an upgrade.
our choices are either 7.4.x which comes with distribution (suse) or 8.0.1 .
We can allow our selfs some testing time and minor changes in applications
if needed but of course this is good to avoid .
So the question is if the 8.0.1 is really well tested ,or maybe we
should move
to 7.4 or just leave 7.3 where it is?
We wil be thankfull for any sharing of experience .
Thanks.