ok, not very many people on here have gone Magnex route, but loads have gone Milltek.
Ask yourself why if its cheaper, why hasnt it been more popular??.What sorta warranty is offered with it? lifetime ownership of the car like Milltek??
Perhaps means you may get what you pay for??? or is it end of line Exhaust with hefty discount.
Perhaps Youtube it and see if you can find any sound clips from there 
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I just think it is just that most peeps associate Millys with VAG cars. Perhaps if we were on a F0rd, Renault or Honda forum, then it might be more equal!
Re the warranty, well they used to have a no quibble lifetime warranty - but because the maker has gone down the pan, that might be a bit of a prob now. However, Magnex really are way up there in terms of build quality, materials, fit and finish, and sound too. OK, Magnex never offered res and non-res versions, and I can't really remember if they did any high flow sports cats either, but strictly comparing a cat back system from Magnex and Milly - there is very little difference in quality. OK, they do 'look' slightly different - but then the same could be said regarding big brakes from AP or Brembo - both excellent set-ups, but just subtle differences in styling.
Re the prices - well yes, the Magnex are now priced because they are 'end of line'. But whilst I also very highly rate Milly stuff, I do have to state that it is very highly priced - maybe even over-priced. But then, as said, Milly offer far more versions for the one car compared to Magnex, so Milly also have to recoup their R&D costs across their entire range.
Re the sound clips - I actually think there was a similar thread a while back with some youtube clips of the Magnex - perhaps you are handy with the search.
