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I think you're missing the point of the ability.

The purpose for it, is to help protoss deal with various early game light harassment and to give them a bit of relief, so that they are not punished so harshly for being out of position.

It's not meant to be the end all answer to everything anyone can throw at them blindly. You'll still have to scout and s**t, and react properly, this ability will simply give you a little bit of flex room.

You should be able to scout and see if banshees are a viable threat, and in the time it takes them to get banshees with cloak for a rush, you can easily have 1 cannon near your mineral line to detect, and then supplement the necessary damage or attack range needed with the ability to shut down the harassment.

If it could detect, and do considerable damage to everything, and was free with the exception of energy, and target-able to every protoss building without a prerequisite, then it would be completely imbalanced. This small ability is already more than zerg gets.

The reason they do it is because they realize protoss must play a positional game, they don't have the most mobile units and have to move around in a large clump, so accidentally falling out of position has frequently been the bane of many protoss players, and often forces them into feeling insecure about expanding, so blizzard is feeling it necessary to give them a little breathing room with this ability. Meanwhile they are also getting the mass recall ability to grant them more mobility, consider that similar to a free nydus network.

All in all, sounds pretty amazing to me, wish zerg got these kinds of perks.

It's not technically "free" in the same sense of a mule. The chronoboost can easily churn out probes like no tomorrow on multiple... nexi? Nexuses? Or easily push out tech faster. Dropping the cannon early game can really change timings and economy for a protoss. Later on though, you end up having so many bases you can throw energy around like candy, but early on that energy will be really important on where you spend it.

I like it though. I hit a point in some games where I don't have much I really want to dump chronoboosts on other than probes, but I'm already highly saturated, so I'll want to expand/tech. Now I'll be able to push out and have slight defense at the base, or be able to recall after an attack.

Also, does anyone know how the recall works? It says that it stuns your units when using it for a few seconds. How much is "a few seconds"? Does it stun before or after they are recalled?