Okay so I have seen both in action yet cannot decide which is the better purchase. They both achieve the same results being the following. Better efficiency, lower LPR and HPR pressures, and a slightly lower decibal sound signature when fired.
That being said, price wise the Techt Kush bolt is superior being $50 cheaper than the Planet Eclipse D.A.R.T. Bolt Kit.
Another point to bring up is that Techt and other such aftermarket accessory companies made bolts before the manufactures had released their own aftermarket bolts and other such aftermarket accesdories. The question I ask is do the manufactures release their own make of aftermarket bolts and such just so that they can retain profit after the initial gun purchase? I would say yes.
You should go with what ever bolt YOU think is better, otherwise you will always be second guessing YOUR purchase.
With that said, if you truly understood the technology involved you would believe anything other than dart is a complete waste of money.
But really it sounds like you already know what YOU want, so this whole thread is kinda useless.
"There he goes. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die." -Hunter S. Thompson