I've always used full grip musky poles, mostly Premiers, Avids and Compres, but liked the looks of the new St. Croix Legend Tournament rods with the split grip. I went down to Gagnons a year ago and spent alot of time looking at the 8' model and really liked the feel of it so I bought it.
I paired it up with a Calcutta TE and it is, without a doubt, the best musky set-up I have ever used.
Not saying the split grip makes the difference, but to me it just feels good.