What do you think about this blaster in comparison to a NF?
I'm indifferent. The advantages to the DTSF are that it is easier to design a holster around without having to alter the shell, and that no external parts move when the blaster is fired. The advantages to the NF are that there is nothing shell-wise in front of the end of the plunger chamber, making it much easier to mod it for a coupler system, and the shell overall is smaller when mimimized. I've also found that the priming motion of the NF is more comfortable, though holding a DTSF is more comfortable to me than holding pretty much any other pistol available.
The reason I say I am indifferent is because my pistol of choice at the moment is the AirTech 1000, which has been serviceable in pistol rounds because of its rate of fire. That, however, is neither here nor there.