Double Uppercut: not so interesting?

I went and maxed DU first, and never regretted it. I use screw punch much more anyways and DU is a good way to get a 1HKO while running along. Backspin doesn't seem to help that much in second job. If you mess up when turning around it is just a waste of time. I also seem to screw punch and then SSK twice and kill a mob instead of screw punch then backspin and then SSK. Backspin concurrently is slowing me down, unless there is mob directly behind me when I finished the mob in front, but level 1 backspin worked fine for that.