Sql Compression

I've had a look at switching compression on for my SQL backup jobs in our 2012 SQL server, and on one database, it compresses a 51GB backup down to 8GB.  :-)

However, there's got to be some caviat or gotchas why I wouldn't want to use compression.

One seems to be you can't restore a compressed backup into an older version of SQL.
I doubt I'd need to do that, so has anyone got any reasons not to use compression for backups?

Thanks