[Persona]

Reapers might do a lot of damage, but this is getting crazy. protect your mineral line!

[Cybexx]

I think reapers are fairly well balanced, they are great against buildings yes, but it doesn't take too many of another unit to wipe them out. You need a tech lab, a bunch of gas and a decent amount of time to get a small group of them together. If I wanted to rush I would be better off going with the large group of marines I could build in the same time.

Because of their Jetpack ability they are great as early game harassment, just jump in behind enemy lines and lay waste if your opponent is caught off guard. However I had one game against another Terran player, he caught me with that trick once, but I placed a group of 3 marines and 2 marauders where he was jumping up and I was able to take down about 6 waves of them before they could do anything. I probably could have got away with less units guarding that spot.

My last game I won with reapers against another Terran player, but I feel he quit too early. I was able to jump in with a group of 5 reapers, take out a few marines and a barracks. But, that was only because the marines were caught off-guard running in the opposite direction. My opponent quit after that, but he had two Marauders close by that could have taken my reapers out no problem.

[Cevo]

honestly reapers early game aren't great.. just atk them cuz reapers dont do squat to units

[Luckishot]

Okay, let's break it down.

To get a single reaper, you require

1x Barracks, 150 min
1x Tech Lab, 50 min 50 gas
1x Reaper 50 min 50 gas

To get a single stalker, you require

1x Gateway 150 min
1x Cybernetics core 150 min
1x Stalker 125 min 50 gas

So, it's 200 minerals and 100 gas versus 425 minerals and 50 gas. Often against a Terran player I will be attacked by one Reaper to begin with before more pour in. Generally they go for the pylon powering my gateway, especially if I have a cybernetics core already built. The question then becomes one of mathematics. On a small map, is it possible to produce a stalker before your pylon falls? Can you afford to build two pylons and suffer a slightly longer wait for your Cybernetics Core? Perhaps you can micro your probes to attack the reaper in order to buy you some time.

Edit: Thought I'd point out that reapers are pretty terrible against Zerg until they have faster movement researched. This topic is more focused on Protoss vs. Terran strategy, as far as I'm aware.

[Robotronic]

Reapers are really rude and amazing harassers, but if you get them into a firefight they will lose.

If you're losing to them, it means you don't have enough defensive units to counter them with.

[Essentia]

Use defensive UNITS not defensive STRUCTURES!

Seriously I thought they were really imba, but they are defeated SOOOO easily with normal fighting units.

For me 2 stalkers can take care of like 8 of em

[OneManZerg]

Reapers are awesome !

Check out how to better use them at http://www.theuen.com/units/terran/reaper

There are so many great strategies for them and scouting with them and leveraging cliffs and ledges.... oh my !

[Moor]

You can find out how to utilize reapers in Starcraft to on this site about the game on this URL right now: Starcraft 2