Those look like 2011 edition bats, maybe you might want something a bit more current?
I have a couple of Kahunas. They are good bats, have a middle sweet spot for "both front and back foot play". Depending on the actual bat you get, they can be pressed a bit hard and take a serious amount of time to open up. Due to the large amount of concaving the sweet spot can be a bit narrower than a fuller profile bat.
Do a quick search on Online Stockists and you will see they have mixed reviews (I have never used them personally but a few of the lads on here have). You might want to consider sourcing a bat from a more reputable establishment.
Note that Kookaburras grading can be a bit all over the shop, therefore, a hand picked Kahuna 400 can be a much better bat than an unseen Kahuna Players.