What’s the difference between the Red Dot and Reflex sights

I've tried it once at a computer store. Play 2D at home otherwise.

Bullet flight mechanics are non-existent in this game, therefore the depth axis won't be of any use.

Distant targets seem even fuzzier on 3D. You can't spot campers in the distance. And let's be realistic: there are a lot of campers out there in multiplayer. I must say I do pretty fine on judging the distance to make a grenade shot from afar. 2D is definitely the better way of doing this.

All in all it was an interesting experience for me, and I heard from the store owner, that some people felt dizzy 10 minutes into the game.

I would suggest you to try it out and see it for yourself. It's a highly subjective experience.

Source (no longer up): http://www.codblackopsblog.com/call-of-duty-black-ops-perks-list/

Tier 1

• Lightweight Pro: No falling damage.
• Scavenger Pro: Doubles your starting ammo with extra magazines and replenishes tactical grenades.
• Ghost Pro: Undetectable by aircraft, Infra-red, and Sentries. The enemy won’t see your name or a red crosshair when targeting you.
• Hardline Pro: Get a second chance on the result of care packages.
• Flak Jacket Pro: Extra fire resistance and reset fuse when you toss back grenades.

Tier 2

• Hardened Pro: Bullets do extra damage to aircraft and Turrets. Reduced flinch when shot at.
• Scout Pro: Switch between weapons faster.
• Steady Aim Pro: Quicker aiming after sprinting and quicker recovery from knife lunge.
• Sleight of Hand Pro: Faster aiming down sights with non-scoped weapons.
• Warlord Pro: Start with one extra lethal and tactical grenade (except smoke / Willy Pete)

Tier 3

• Marathon Pro: Unlimited sprint.
• Ninja Pro: Louder enemy footsteps, makes you completely silent.
• Second Chance Pro: Survive longer and teammates can revive you.
• Hacker Pro: Booby trap enemy Care Packages and turn enemy killstreaks and equipment friendly. Makes you invisible to enemy motion sensors.
• Tactical Mask Pro: Reduces the effects of flashbangs and concussion grenades. Reveals the location of a flashed or stunned enemy.