Fortune Lounge has a number of Microgaming casinos. Royal Vegas and Seven Sultans come to mind as Prima skins they already have.
The issues with Fortune Lounge range anywhere from really slow payments to affiliates, lack of support, and players have had endless complaints about their support and bonus issues. A few months ago they attempted to retroactively change the affiliate agreements, this caused a major uproar. Below are two articles about it, FL backed down.
http://www.rakerebatereview.com/sept2/affiliates.asp
http://www.rakerebatereview.com/sept9/fortunelounge.asp
They are still listed as reputable at Casinomeister and surely have endless happy customers, they do however get some very bad PR posts in the forums by disgruntled players and affiliates. Most affiliates on my site stopped offering them many months ago, even before several other Primas started paying out enough to offer 35% rakeback.