The mag extender is great, hands down. Makes the release much more accessible for the firing hand while also keeping it out of the way (unlike the original that jutted downwards).
The Mag delete is great if you plan to only run half lengths. It sticks out just enough so that you can remove the mag adapter if needed, but it would be completely impractical to try and run full length mags with it. This isn't a negative point, as it is clearly stated to be a mag release delete, but folks should consider what type of darts they plan to run before purchasing it.
Overall another pair of great upgrades for the DZP Mk3.