I've had good luck with the Brewer's Best Conditioning Tabs. I've seen many people complain about white floaties in their beer after using the tabs, and while I've noticed this in bottles that are still conditioning, it's never been present in bottles that have been pulled from the fridge.
As I don't exactly have the room for a keg setup, I always bottle condition my beers. I usually batch prime, but if I decided to put half the batch in a Party Pig, I will use the tabs for the remaining 18 bottles or so. I've thought about trying the Fizz Drops, but haven't yet.