I have worn Simpson and for several years wore Deist two-piece suits. A few years ago, I purchased a Carbon X one-piece SFI-20 suit from Design 500, the only supplier of the Carbon X material at the time. It cost $1,200 but I consider it worth the money. It is more comfortable (lighter in weight) than my previous suit and still offers more protection. Several safety suppliers now have Carbon X suits in their line of fire suits.
Tom