I picked up the Impact Powersync16 radio trigger set a couple month back so I figured I'd do a quick write up. The kit comes with one transmitter and one DC receiver. There is also a kit that includes one transmitter and one AC receiver for use with studio lights (The DC kit will also work with studio lights but requires battery instead of just plugging into the studio lights power cord)
The impact powersync16 is B&H's "house" brand radio triggers. Here is a LINK
to the kit for more info/specs.
Build Quality:
They are made of plastic and aluminum but have a very strong build quality. They feel like they can take some abuse and still come out working without an issue in the end. They don't have that "fall apart in your hand" or "treat them wrong and they will never work again" quality to them.
In use:
Both the transmitter and receiver come with a set of dip switches that can be configured to give you 16 different radio frequencies. They do not offer TTL, have a max sync speed is 1/250, will not do rear curtain sync, and they do not offer HSS. The transmitter and receiver can also be used as a wireless shutter release (more on that later). The listed max range is 200+ feet out doors and 590 feet indoors. I have only tested them out side at 140 feet but they worked without a hitch.
Simply attach the Transmitter to the cameras hot shoe and attach the flash to the receivers hot shoe. Make sure both are set to the same frequency, slide their power buttons to "on" and start shooting.
Included with the receiver is a lanyard that has a small tool to change the frequency, a locking accessory shoe so it can be mounted on a cold shoe, two adhesive backed shoe mounts, a 3.5mm sync cord, and a 3.5mm-1/4" adapter. The receiver runs off of 2 AA batteries.
Included with the transmitter is a PC-1/8" Sync cord. The battery door can be removed and on it is a small tool to chance the frequency. It runs off of a CR2450 battery
In use both units have worked flawlessly however the camera (I use a Canon T1i) does not register the transmitter as a flash so it will allow you to go over the max sync speed and will not allow the use to 2nd certain sync. As stated before the units do not support wireless TTL or HSS so if you need either look else where.
The receiver can be screwed directly onto a flash bracket, attached to a cold shoe using the included accessory shoe (it screw onto the bottom), or can be used as a stand alone without the use of a flash stand (AKA it is its own flash stand)
Both units come with LED's built in to confirm that each are set to the correct channel. Simply half press the test button on the transmitter and the led on the receiver and transmitter should light up. If it doesn't they are not set to the same channel (or one of them is off).
I have yet to have the flash not fire while using these unless the flash has not fully recharged. Granted on a T1i that is only about 3fps so its not like they have really had much of a work out 
To use as a wireless shutter release simply attach the receiver to the camera using a sync cord that can be bought separately. I did not buy this however I found that the transmitters sync cord will work with my T1i. The receiver has a PC port on the top but the other end of the sync cord is a 1/8" male connector that will work on the T1i.
Now I am not sure if that sync cord is supposed to be used in this fashion as it was quite quirky. It did work but the camera would only focus in AI Servo and I was not able to preview or play back any photos while the sync cord was attached to the camera (with or without the receiver attached). I'm hoping that this is not how it will act with the proper cord however I could not find a Male mini/3.5mm cord on B&H's site (The receiver has a 3.5mm female port on the side as well). In the end I did not buy this as a wireless shutter release....but still would have been nice to have the option
Conclusion:
I am please with this purchase. They are not as inexpensive as the Yongnuo trigger but not as expensive as the Pocket wizard. They have a very nice built quality to them and work flawlessly (well as flash triggers at least)
Pros:
Fairly inexpensive
Good quality
2.4GHz
16 different channels
Good range
Receiver is its own flash/hot shoe stand (stupid but I really like this)
Cons:
Transmitter uses an odd "watch" battery
No TTL
No HSS
No rear curtain sync (I haven't had a need for this but would really like it)
Now for Picture goodness:
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Powersync16
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powersync16 transmitter
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Powersync16 receiver
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PS16 on camera
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PS16 on camera
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PS16 used alone
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PS16 mounted on light stand
by gremlin75, on Flickr
