Hello WPMU Dev Support,
My client is very happy with the e-commecre website developed using MarketPress plugin, Framemarket and Gridmarket themes.
This works excellently on PC and iPad devices, he has asked if a more user friendly layout can be put in place for a mobile device. My thoughts to achieve this are:
1) Have a plugin that identifies the device and diverts it to another theme, pages and menu system e.g. iThemes mobile plugin
2) The SimpleMarket theme looks spot on for a mobile device
Guessing you must have already advised clients on this and prior to setting up a test environment and putting in a lot of effort wanted to get your guidance based on your experience.