I have the LG Oslo chamois tights, and they are GREAT! I wear them a lot they are way comfy and good chamois. However...they are not quite as supportive (firm wise) as my Shebeest Tech tights:
http://www.teamestrogen.com/products.asp?pID=11094
My tech tights have the absolute greatest chamois. And they are very WARM and snug and supportive, without being bulky at all. They are actually warmer than either my Oslo tights or my Shebeest Windpro (chamois-less) tights.

By the way, both the Oslo tights and the SB Tech tights have nice smooth looking chamois pads without any strange diaper butt ridges.