I don't think they get what a chamois is really for. It's not for padding, it's for chafe prevention. If you're going to put it in regular style underwear, it defeats the purpose as you'll get chafed from the leg openings on the brief itself.
Personally, I find that the thicker the padding, the more I get chafed. I like a thin but fairly stiff chamois in my road shorts. For just tooling around town, I'm not on the bike long enough to feel the need for it.