I saw that exact jig system used in a recent episode of "This Old House", although they had the name covered up and never said the brand, probably because they weren't a sponsor. Looks really neat.
It basically is an improvement to Kreg deck jig system elimanating the drilling by clamping jig to the borard just need the spacers. It would be faster not drilling pilot holes. Screws are similar to kregs. However the drilling would set the shoulder better . I cant see you putting the boards down like they were just starting at one and moving across you would need spacers like kreg system. I put down a kreg deck worked well with trex decking.
I found you had set about 3 floor joist in the middle first also before you start test fit sometimes you had to reverse the boards inorder to get good joints. Contrary to popular beliefs the composit decking is not perfectly straight either. The good thing about the composit its flexable and you could take bow out by going back to the ends and setting your ends and work back to the middle.
The main thing i liked or that i read up about this is it has a built in spacer which is nice, but i have not seen these in person to really see how much i like it or not...
If boards were perfectly straight you would not need spacers but there not. I'm sceptical of that claim. If they were straight all you would have to do is set the 2 ends and just go down the board and finish the setup