I have three ordered from the cables with M8 eyelet. Two of them were properly handled and corresponded exactly to the high M6 variant that comes also the battery charger CTEK MULTI XS 4003. The third cable, however, was so badly handled, how "of Down" has described it: the cap does not keep the ring terminals look like even "tinkered off" and do not kink. This cable I sent back because it is substandard and does not meet the quality standard of other Ctek. For this version, there is therefore only one point.
Otherwise remains to say that the leadbatteries would sometimes have to be a little longer. Although they correspond to the description (40 cm), but I would be 1 m or 1.5 have been significantly better. In cars, where the battery sits in the trunk or under rear seat, 40 cm are very tight.