CPAN version numbers less that 0 don't always necessarily mean "alpha". For instance POE is still at 0.31 but many people have been using it in production code for years. If you look at the CPAN Testers report for the module in question you'll see it's been checked out on a large number of platforms with only a few hiccups.

Update: As adrianh mentions the docs are a good place to look for alpha-ness, and also check the "DSLIP" notation from the module list (which coincidentally does say that Devel::Coverage is considered alpha by the author :).

CPAN version numbers less that 0 don't always necessarily mean "alpha".

True, but the author saying "If you can't guess by the version number this is an alpha release." in the docs probably does :-)

Hi Thanks But I thought that was a alpha version

While the author is still classifying it as an alpha release it's very stable and works well. There are a few odd corners where it doesn't give accurate results but it's the best Perl coverage tool by a long way.

I use it all the time for production work.

cpan modules that contain an underscore in the version number (e.g. 0.53_1) are officially developer (or alpha) releases, and are marked as such on http://search.cpan.org