It arrived - brilliant...
I'd only reccommend it for zandering as it's so fine and supple. It's literally more like cotton than wire and I reckon you'd bust it if you tried to stop a lump on it.
The 25lbs Caliber is a totally different wire, which is actually slightly thicker than 30lb Fox without being much suppler.
It's big advantage is it doesn't always need changing after every fish, but to be honest I almost always do this. The only times I've ever had problems with traces, hooks etc is when I've been lazy or asked too much of them. The words "that'll do" have probably caused more lost fish than the rest of the English language put together.
I've found the 15lb Caliber knots up ok, but still use the half hitch/crimp and knotless knot to attach hooks. The 25lb is hard to knot and won't hold a twist either, so you have to crimp it.
What was the wire Paul, was it Marlin strand or Steeldtrand..? Someone told me this has come back onto the market in a different guise. Cabelas in America might be worth checking out as they do all kinds of hooks, braids, wires etc you can't get at twice the price over here.