I live in the canaries, and from experience I'd say that Visanta are JUST as bad as the other Electronic shops...
Buy ANYTHING of value here at your own risk...
especially off-brand goods.
The canaries are to all purposes exempt from EU wide consumer protection laws.
If it looks cheap, then there's a catch, always.
These shops are set up to sell to holiday makers,
so long as the items on sale last until you go home, they DON'T CARE.
The customer service in the tourist areas its non-existent.
just to repeat..
VISANTA are not an exception to the "beware electronic shops" rule, they are part of it.