century for HVX200: adapters and converters

any users/opinions on Century Precision Optics for HVX200
(1.6 tele converter; .6 wide angle, .75 wide angle and fish eye adapters; range of + diopters) -- quality of glass for HD? -- usefullness?-- alternatives? (Cavision? others?)
(on the scale from 1 to 10)
 
1.6 is the only teleconverter available, and it's great.

I've got the .6, it's sharp and inexpensive, and very wide, but does contribute a lot of barrel distortion.
 
Is the 1.6 tele zoom through and does it work throughout the zoom rang?
i saw one recently that was only good on the end of the lens otherwise it vignetted terribly.
 
It is zoom-through and it works through most of the range, I think it doesn't vignette until down around 17mm or so.
 
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