i've not tried the mamba guts yet, but i have tried the early batches of Global and VS Team (non-BT7) in my PS 6.0 and VS Team without a doubt plays smoother, holds tension better and is more durable than the Global stuff. VS Team/Alu Power in my PS 6.0 feels so buttery, provides effortless yet controllable pop, while able to generate very good spin and great pace, all the while providing incredible control. the Global Gut/poly played NOTHING like the primo stuff. because the VS Team stuff holds tension much better, i was able to string it at 50/46 while i had to string up Global at 53/49 and within a few days the mains had lost so much tension it was time to restring. from my experiences, primo gut performs far better than econogut.