Hey guys
For what it's worth I have been using this same esky with braid for the past year or so, indeed my entry to all grain. I have recently upgraded to a larger esky (44L) mainly because the braid really bugged me (ok more beer was also a consideration). I have made a copper manifold which was easy and cheap and it has revolutionised sparge time/functionality/control.
The braid, whilst functional, seemed to run very slowly and on occassion stuck resulting in an annoying 2 1/2 hour sparge on one occassion. i have kids and a bunch of other stuff I should be doing. The new set up has meant I have full control over flow and therefore time involved.
Just my experience, as i say the braid worked fine but gave me headaches and proved to be the one annoying factor which has now been eliminated by using something else. The poly looks like a good idea...