Are they good?

The prices at amazon.com seem cheaper than say, even those on the WTS threads.

In particular I'm looking at these items:

http://www.amazon.com/Opteka-Angle-T...0401596&sr=8-1

http://www.amazon.com/Opteka-Profess...0403677&sr=1-3

My bro goes to US every June and December, so I can conveniently tong pang him to get, so no international shipping needed.

Are they good? Or am I just gonna get ripped off?

Thanks.