I highly recommend White Lightening, especially for MTB. I've been using it for years. It doesn't attract dirt, which makes for a smooth running chain and less cleaning. Also, it doesn't wash off like the liquid lubes. So if you ride through lots of streams (like me) or ride in the rain, this is a good thing.

Initially, you have to apply liberally, so if you didn't do this it may be why some of you seem to notice more pedalling resistance.

BTW, I have tried the Pedro's Ice Wax on several occassions and found it to be to thick and didn't penetrate into all of the nooks and crannies of the chain like the White Lightening does.