The Magnaclean was a nice idea very poorly executed. Avoid at any cost.
The TF1 is a good product, we've only had one problem, and that was dealt with excellently by Fernox, couldn't ask for more.
We've been using Spiro products for over 10 years and have fitted hundreds of air and water separators, with not a single problem. Spiros have a set of gauzes inside, they are designed to slow a proportion of the water passing through the filter body. When the velocity drops, air and solids tend to separate. Just like they do in a radiator!