Thanks guys im assuming by the responce it's knot (pun) used widely here, after my initial post i tried different ways of searching the why's on google and have to wonder about the reasons behind the development of the knot

in several articles it was mentioned that it is often used in comps where there is a line class to increase the strength of the line at the business end, now in saying this as i menioned previously the knot acts as a spring so knot only is the line doubled but it has a built-in shock absorber which Larry mentioned in his reply. Further reading produced a test carried out by salt strong between the FG and bimini/+joiner knot, according to their tests the FG won all but 1, however when the FG was used following the bimini the total setup was a winner, now this is only testing the bimini for knot strength not testing it for (what i think) is it's intended use.
My conclusions so far are somewhat mixed, doubling the the braid and having double the knots to travel through your guides when casting seems a bit much, however for trolling this would make very little difference, the thought of having a shock absorber on the business end when that fish does those sudden moves you might not be prepared for it could be the difference between landing and loosing, is it worth the effort to use the bimini twist? In my opinion yes! However only when trolling and in situations where the spring affect is what your after, like Larry explained
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Will i be using it? Hmm im tempted to try it on atleast 1 trolling setup, i will practice tying it thats for sure as you never know.