Typhoon is awesome, loads of power and spin. Black magic has feel like natural gut, it's better than some multis I've played with. Genesis Spin X is a lower powered version of typhoon but retains tension longer and has the same pocketing. I have not tried xplosion, heptonic, or hexonic.
I have tried black magic and spin x. I think both have good ball pocketing (for polys), maintain tension well and have good pop. I prefer the spin x over the black magic, to me it's a little more lively.
Got some samples and I'm really diggin the Black Magic. Its my 1st time playing with it. It has suprisingly impressive ball pocketing in both the 1.29mm and the 1.23mm for a co-poly without being mushy. Really outstanding feel for me at the net. The 1.23mm has a little bit more power and spin.
I'm a bit concerned about the durability of the 1.23mm, as there's some pretty good notching after 3 hours of hitting, but the tension maintenance has been very good.
I'm playtesting the same gauges in the Spin X next... can't wait.
I am currently enjoying Typhoon. I have a reel of BM to. It has become my standard poly for friends who want a hybrid. I use it with ProSupex Titian in the crosses. Everyone seems to like this combination.