Hi Anne
It seems a bit of a love hate product really - it doesn't to me have the coverage of a foundation, but I do like it over a tinted moisturiser or even just over primer for everyday wear. I still use concealer under eyes though.
We have a Halo 'try me service' - more really as a colour match as the product is designed to be grated fresh for each application - for maximum hydration, but the try me service is very popular.
With regard to covering redness I think it will depend in how much coverage you need. It doesn't cover the few broken capillaries I have, but over concealer it does give a lovely finish to the skin.