Yup.. I have tried the Roast Beef. It did taste like Roast Beef but it had a kind of sweetness to it that I didn't like, which was most likely from the VG I mixed in to the mixture. iStormUK has tried the Roast Chicken I believe..
I still have the almost completely full bottle of Roast Beef concentrate sitting in a shelf far away from everything else. I remember when I received it that I could actually smell the flavour through the sealed postal package! None of the liquid had leaked, it is just that strong and pungent of a flavour... Some people do like those kind of flavours, I remember iStormUK saying he really liked the Chicken.. but I don't.. it really sticks to the atty as well.. so you are going to have to throw the atty away after using it, or suffer the lingering taste of Roast Beef on that atty. I also remember trying some coffee flavour on the same atty, after the Roast Beef, and it kinda.. sorta.. tasted very roughly like Marmite/Vegemite.. :p
Here's a review, by profBeard on the Diablo Loco as well:
http://www.liberty-flights.co.uk/forum/index.php?topic=1733.msg35759
