That I can hook up a keyboard and play into my iPad is phenominal--I does what it advertises and does it well. It has changed how I use my iPad entirely. Love the price and portability. There are a couple of cons you should be aware of:
1) the 30 pin plug may not fit in all the way on with certain iPad covers, and even if it does, the fit is loose and easy to disrupt. If you do disrupt, you have to unplug and replug the unit.
2) I found the charging feature will not charge an iPad. I plugged the usb cable into my factory 10W charger and my iPad still indicates it is not charging. It probably is, but at iPhone levels which is just a trickle.
These quirks are not deal breakers and I would definitely, definitely recommend the product. If used in live performance I would secure the connect somehow and make sure my iPad is completely charged.