I met a Bulgarian once in my travels in MKD, and he came from Varna.  He could understand me pretty well, but I found it a bit difficult to understand him, although, now that I’ve been listening to Bulgarian music lately and I have picked up a few of the lexical differences, then I’d probably understand him better now if I had the conversation again.  It would be interesting to see if I could hold an intelligent conversation with my dialect if I ever traveled in Bulgaria.