Because there's no pass-though dock connector on the case, while it will fit into a universal dock with the plastic adaptor removed, there's no point in doing so because of the connector incompatibility.
The charging case has micro USB for syncing, but that won't help you dock the phone to speakers
If you have to take the phone out of the case for music playback, you may as well leave it out and stick to cables for charging. Indeed, if the iPhone is the only handheld device you charge regularly, you may find it's drop-and-charge approach no more convenient than plugging the phone in in the usual way.
Apple's little adaptor is slightly more power efficient. I measured 4.5W when charging the iPhone 4 this way - the Powermat drew 6W.
Powermat's system really comes into its own if you have other stuff to charge too, but you'll have to pay extra for a bigger mat for that.
I like the idea of wireless charging, but there's no advantage to it - but some big downsides - if you have only one device to charge. Multi-handheld households will, however, appreciate having a single point to power up all their kit. ®
More iPhone Accessories Reviews
Ten iPhone 4
Ten iPhone 4
Powermat iPhone 4 wireless charging kit
A really expensive way of charging batteries
It still needs to be plugged into the wall, why is it worth spending £50 on a thingymabobber that is no quicker or easier than plugging a charger in?
It's not only Mr Jobs who pumps the fanbois for their hard earned cash
It's not Wireless
It's a connectionless connector!
The pad still needs a cord. It's as wireless as my cordless kettle. The fact is a 30 year old "holster" as used on Mobile hand-held radios works better and cheaper than these "mats".
Hmm, any boffins out there care to see how much emag radition this thing is spewing about? Or how much power the induction connection wastes?
Seems like plugging a cord in is a lot easier. And for multiple devices, just get a USB hub and cables. I have a 7-port charging station on my desk. Woo! :)