I regularly run reduce against the PO to great effect, but it seems to not help much with archives.
Users claim to have deleted hundreds of MB's to GB's of email, but still the archive volume is peaking.

Should gwcheck reduce jobs be able to properly compact archives, as it does with the PO?

If not what are the best options within GW or using 3rd party software?

I see that GWAVA have Retain, but have not personally used it. The single instance storage of a messages and attachments looks nice.
Can anyone vouch for Retain, or recommend similar products.