I find them slightly better than JAT.

- Staff is less Sowjetesk
- Planes are only ancient not stoneage
- Reliability is a bit better (only 2 massive delays and rest on time on Montenegro and almost nothing on time on JAT)
- Communication of delays is just as horrible. Use blackberry travel app to know how badly they are lying to you.
- Once I re-upgraded myself as I had a full-C ticket on Belgrade Podgorica but was donwgraded at checkin. I took the seat of a deadheading crew member who did not complain to me and went in the back. Drinks from plastic cups, sandwich served (probably same as longer flights get in Y).

On JAT I feel very unsafe, on Montenegro just unsafe. Hope this helps.