Trainers are best used after you've beaten the game legitimately once. For Revelations specifically, the campaign is short (8–10 hours) and fair – a trainer is overkill. For Raid Mode's 50-hour grind, a trainer can be a sanity saver. Final Verdict Score: 7/10 (for the trainer tool itself – not the game)
All toggles are hotkey-based and can be turned on/off mid-game. No crashes observed with FLiNG/WeMod trainers over 20+ hours. Without trainer: Tense, ammo-scarce, backtrack-heavy. Some enemy bullet-sponge issues on Infernal difficulty. With trainer: Turns into a linear action shooter. Infinite ammo + no damage removes all fear. One-hit kill trivializes every boss, including the much-hated Malcolm (scagdead) and Ultimate Abyss Tyrant .
Most trainers work fine offline. Online co-op with trainer active will desync or get you flagged by Steam (no VAC bans reported, but risky). Use offline only.