My experience to date (after joining ANS in January 18) has been very positive. The success rate of the Ab-Initio programme rivals NATS and the certainty of knowing where I was going to be posted was far better for me. As people have mentioned above, Edinburgh is TWR/APP whereas Gatwick is TWR only.
I disagree with the comment above that ANS have a poor track record, the EFPS failure the other day was unprecedented, but failures occur in technology all the time - I don’t feel like ANS has had more than a “normal” amount.
If anybody has any questions about the ANS process I’d be more than happy to help where possible 🙂