I purchased the non blowback option first to see if this would be something I'd use for practice since it was $50. I ended up with biodegradable BBs, CO2 canisters, the air pistol replica of the Shadow and one magazine (there does not appear to be anyone selling extra mags for this variant, only the GBB version).
It's light since it's plastic and each shot has zero recoil although the sound is cool albeit fairly quiet. I was impressed it went through some splatter targets at 5 yards, and will do a more thorough test when it's less windy. I have no idea what 6mm paint bbs will work with this but I'd like to find some.
Was it worth the price of 10000 bbs ($29), the pack of 15 CO2 cartridges ($13), and the pistol ($50)? Sure. I will be able to work on holster draw (which reminds me, I need to see if it fits my SP-01 Tactical holsters), sight alignment and picture, shooting multiple targets quickly, let work, muzzle control, finger off the trigger control, yada yada. How well that translates will likely be more or less the same as dryfiring, but the sound and the target splatter adds a bit of fun to it all...