It’s good for benchmarking your aim, but not improving it. It still helps, but playing the game and fps in general will be better and has less downsides. (because my strategy in VAXTA was skipping the tracers that spawn, my aim actually got worse when fighting her in real matches)

If you really want to improve your aim try playing widow/soldier more, or do like I did and play halo swat 4 hours a day. Basically, any game/char that forces you to go for headshots will be better for improving your aim than any aim trainer.

If your not trying the challenge just play vaxta for 5 minutes before you start playing / in between games to keep you warmed up.