Personally I'm using FS + unixODBC + myODBC for MySQL with no stability issues. It should be fine.
If you do get issues report them on the Debian BTS - I'm sure they'd get it fixed, either by an updated package or backporting a fix to the current version. Bugs only get fixed if they're reported to the correct place people!
In any case I don't think you'll find problems with myODBC, but obviously test before rolling into production.
Wheezy is still 'testing' and shouldn't be on a production machine yet anyway, if you need newer packages check squeeze-backports (http://backports.debian.org/) first.