Untangle is a marvelous product.  It does more in a single installation than any other product on the market, commercial or otherwise.  The incorporation of third party open source projects means that there is a diverse body of support and updates for the product and a mass of humanity working on keeping the various components current.

If you are a small to medium sized business looking for better protection of your network, use this product.  Buy the Professional Package.  You will not regret it.