How do you get that? It reads to me: Most of, almost all, majority, not all...but most. Your mileage may vary, but I'd say (as have others here) that the statement holds true for an overwhelming majority (and also clearly on the very reviews section you speak of). The wording is very clear. You're trying to interpret it as "SkyMaxx Pro guarantees you 100%, without doubt, improvement in FPS over default"...it doesn't say that.