I just started looking into vertical growing and was wondering if anyone has seen or used these:

http://cgi.ebay.ca/Stackable-pots-for-vertical-plant-flower-veg-gardens_W0QQitemZ320413051900QQcmdZViewItemQQptZPlanters_Pots?hash=item4a9a1b2bfc&_trksid=p3286.c0.m14

They look like a type of stacking pot and are quite attractive, just wondering if anyone has used or thought of using these?

Regards,
Robin