ACE VR is very cool. Like most dryfire, if you treat it honestly and appropriately, it can be a useful training tool. Mostly what I see value in is stuff you can already do with a room and dryfire targets though. I had a conversation with Mason at worlds about it and our consensus is that it's a fun video game and nothing more.
In my whole IPSC career I've spent $50 on dryfire, the Go Fast Don't Suck IPSC mega pack. Best money I ever spent. You can get to where I am with nothing more than that. I personally won't spend the money on ACE VR based on real-world training value. If you find it super fun and see the entertainment value in that, go for it!
