Sean,
I am using the smaller set (6080) on my 180. They are plenty strong for the 6100 and Wavebox...don't know about the 6200. Probably ok if you don't point them at too much of an angle. I didn't really care for them on my Streams because they pointed down a little when mounted on the magnet, causing sand storms. The standard bracket with long screws was more adjustable.
It seems like these magnets were made for the Wavebox...they fit perfectly and are darn sturdy. I had to do a little mod on the upper magnet though. After positioning the Wavebox, the upper magnet was half on, half off the AGA trim. I remedied that by cutting a piece of 1/4" acrylic to "shim" the magnet up to the same level of the trim. So the outer upper magnet sits half on the trim and half on the acrylic piece. Can't even tell it's there and the Wavebox hasn't budged!
Hope that helps...Roger must be out Holiday shopping.
Luis
p.s. ...there's a guy in the selling forum with these magnets for $80...hurry!