I had 3 flights with eznis - from Buyant Uhaa (ULN) to Murun (MXV), from Murun to Dalanzadgad (DLZ) and back to Buyant Uhaa. As a result I had 2 flights delays for 6 hours each (so, the whole day was lost which of course affected my travel plans). Very poor English of the staff even in head-office and nobody knows what is going on. The third trip from Dalanzadgad to Buyant Uhaa wondered even myself. They moved me and my wife from the 9 am flight to the 5 pm flight (most likely to fit into the plane an organised group of tourists) and I found it only when I was trying to check in. I would recommend this airlines only if you are happy to lose 3 full days of your trip and stuck in the middle of nowhere for a day or so. Onboard service however is good enough.
Should I buy my ticket online or through a travel agent?: Most travel agents also sell tickets for lowcost flights. A travel agent usually buys a large number of tickets at once, so that he may have some discount on the total price. But he adds a commission to the initial price. So if you buy your ticket through a travel agent you may pay a higher final price for your plane ticket. It's always a good idea to compare prices before buying your ticket. However, keep in mind that the cheapest tickets sell first, so don't waste too much time comparing!