Long since discarded the tags, but I have a Deer Hunter Ram Jacket - which I think has the Deer-Tex membrane?
Ram jacket is well designed for stalkers - right down to rubber facings to press studs, anti-slip pads on shoulder etc.
Particularly attractive for podgers like me are the ventilation zips under the arms.
Say all this to underline I think a lot of thought went into the jacket.
I have worn it a great deal and not had any significant water penetration through the material, but did get seepage at zips etc. Windproof too - so feel membrane probably works as advertised. However the micro fleece outer doesnt shed water for long and once beading stops it soaks water like a sponge - easily doubling the weight or a fairly heavy jacket in the first place.
Final niggle - the main zip started to tear at the bottom after first year.
Rambling - niggles aside, the Deer-Tex membrane seems to work as well as any of these things.
Hope that helps.