The idea of garage sale is great however there are quite some week points

Yes you can use iPhoto however the software does not resize the pictures correctly so that the listings often looks very bad and you have to first prepare pictures in Photoshop

The templates do not tell you which picture size is needed so it's a guess game.

There is no proper way to name your listings it always has the name of the ebay listing description. This makes it very difficult to say test several listings in different categories.

GS becomes very messy after you have listed many auctions there is no good way to find out which listings worked and which dident.

Templates are nice however the headline is often in a very weak font and hardly readable not a headline so to say.

developer responds fairly quickly but always seems anoyed with you if you find a bug. Should be the other way around.

I still use it for my occasional privat listing but stoped using it for my business litings.

It has a colour coding for auctions however it's nowehre explain what the colours mean.

GUI is not very intuitive