Chip, I love the "sandbelt" bunkers. And while I appreciate the blown out natural look, I may be the only one on the sight that doesn't like/love them. They've always looked faux to me. Like I said, I understand the theory and intent behind them, but emulating natural blow outs or rough edged bunkers with shaggy "natural" edges in landscapes that clearly would not provide either naturally seems to defeat the purpose for me.
I like bunkers to look like bunkers, not like something that existed there for centuries when it clearly didn't. I really love the look of pot bunkers and cop bunkers, and flat bottom grass faced "Ross style" bunkers.
Most importantly though for me what I love most about the Huntingdale/RM/sandbelt bunkers is the proximity of firm, short grass up to the edge of the bunker. If it were up to me, that would be a USGA mandate.