Flew with Balkan from East Mids 2 years ago, we flew on an old Russian Tupalov which I believe are no longer in service. No problems at all with the flight, the meal was a bit strange (cold meat (I think it was meat) and cheese)but the bar service was excellent, a 500 ml beer was about £1.50, me and my brother in law thought they'd got the price wrong but the 2nd and 3rd bottles cost the same
Flew with Balkan from East Mids a few times, no worries other then indefinable meat snack on board, Balkan flight but delayed a couple of times though.
Here's a hint, if you get to the airport and you're delayed you can pay £18.50 for 3 hours in the executive lounge. Nice and comfy, open free bar and snacks