Tweet Affordable negative scanner. Help me.

I would like to ask if somebody tested or acquired some of these actual low cost 35mm negative scanners from eBay.

http://www.ebay.com/itm/New-5MP-35mm-Ne ... SwpRRWmLAd

http://www.ebay.com/itm/SainSonic-2-3-L ... SwU-pXvRlH

http://www.ebay.com/itm/Ion-Pics-2-SD-P ... 2358940945


Does it have fine sharpness?
Is it rich enough in bits to restore fadded negatives ?
What about dynamics range?


I didn't found any good review. People put videos of themselves opening the box and talking anything, in other words, useless reviews...