I've only had one and it was the worst cigar I have ever smoked. I bought it from a local tobacconist and he had correct humidity (65%) and temp (about 20C). I'm fairly sure it was real because half way through smoking it I gave up and pulled it apart. There was nothing funny looking inside, no loose/shredded tobacco or anything like that. Plus I've bought sticks from this bloke before which were all fine.
The flavour was like burning rubber: acrid, harsh, acidic.
I would be tempted to try one again (from the Czar of course) if I could justify spending money on a single that I wasn't sure I would enjoy. I might trade for one at some point just to see if my experience was a one-off.