I'm a very satisfied Gambit user, as my program became fast enough to refute some C calculations my advisor made 20 years ago. My advisor was clever enough to prove his answers were wrong, even though his program no longer runs. Thanks to Marc for offering to help optimize my code: that got me to look at my code myself and make an obvious optimization. Guillaume's profiler certainly helped locate a hotspot.
But I think Gambit is a lot better than the manual would indicate to a non-expert schemer like me. I have 4 "advertising" tips:
Thanks for the advertising tips. I will see what I can do. It should be clear now that I don't like hype... What you read (in the docs) is what you get.
Marc