I'm not sure if anyone will believe this, but a week before it came out, I was wondering "hmm i wish there was a tensioner out there" and here we are! LOL. but seriously I screamed when my friend gave me this, he didn't want it for some reason. It was stunning to see my terrible badly tensioned cubes become Main worthy. EVERY SINGLE CUBE BECAME MAIN WORTHY. If you want all your cubes to match your mains, it's the tensions. If you can do it GREAT! If you can't (me) get this! It's awesome THANKS MOYU!