I've been using it heavily since it was first made available
and I've still only used 8% of the archive of which 75% is
taken up with very large multimedia and jpeg files.
An easy way to get past the 2 gb limit is to create
a backup id and forward all archive to it.
OK... yes it'll make it slightly more bother to find old mail
as 2 archives might need searching but if $20 is a big deal
it is an option worth considering.