Gauntlet seems to have suffered in that it has lost market share, but in no other way that I can see. Gauntlet is fine for what you mention (with filtering rather than proxying for Web server access from the outside, if performance is the #1 priority). Any of the major firewalls are fine given no other information. I'd always pick Gauntlet or Raptor over Firewall-1 or Pix, for security reasons.
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