Finally, I bought them for a reasonable price.
The quality is top notch. The contacts shown here:
NEX-7, E 50/1.8, f/3.2, 10mm tube, handheld.
are really durable, unlike the ones found in the NEX cams.
It will be interesting to do some close ups with the stabilized lenses (kitzoom and the 50/1.8).
Kit zoom samples:
18mm (10mm tube)
51mm (16mm tube)