Classic Mode is
fantastic for levels like Outpost, Bunker, and Statue where you do a lot of stealthing. Makes sneaking by and taking guards out quietly much more rewarding and intense as you know if you screw up you're going to have to deal with dude who'll eat away your health and armor.
But be prepared for controller breaking hell on stages like Nightclub and the Construction Yard.
And I didnt unlock
anything for completing 007 Classic, which had me quite bummed. I tried out the Tank's time trial to see if that unlocked anything, and nope. There doesn't appear to be any unlockable cheats at all.
Because of this, I probably wont ever do the time trials. As much as I enjoyed the game, I see no reason to push myself into tedious clock racing. Especially when there's no unlockables, you cant skip cutscenes, and I already put myself through the hell that was 007 Classic Citadel
.