Simon,
before i start i just want to make it clear that i am no pro or expert.
I have tried and used YGK Ultra Jigman which was a few year's a go and i still have and use it now, from memory i got it in 60 pound as when i got it that was one of the lightest i found it in at the time of purchase.
I like it as a jigging braid and i do believe in my true and honest opinion that it is a good line apart from the fact that there are many other braid's out there as i am very, very sure you yourself and everyone else is well aware of.
since i have had and used it, there has been absolutely no issue's with it (the YGK Ultra Jigman) what so ever and i am happy with the choice i made. Having that being said as i am very sure yourself and everyone else know's that what one person like's e.g=a line or lure, another one may not like or may or may not have problem's or issue's with. As i have now got YGK i am considering my-self on getting a spool of either Varivas Max Power or Big One. I have not decided yet on which one i am going to get.
to be honest with you again, I was considering when i bought the YGK which one to get out of the Varivas or the YGK but the shop i bought the YGK from did not have the Varivas however if i did decide on going with the Varivas instead of the YGK, I was going to place an order on-line.
I hope this is or may be of help or assistance to you with making your choice on which braid to get.