This is a great alarm clock. As other users have mentioned, the sound quality is not super bass and super loud, but from a speaker this size (and an alarm clock) it has pretty good sound. My favorite feature of this device, is the size, it is pretty small (it looked humongous in the picture), which is good, because my night stand is small. The other nice feature is the dimming. I have always hated alarm clocks that light up the room, and in the past I have covered alarm clocks with towels to cut out the light, this alarm clock can go from bright, dim1, dim2, to no light all with an easy push of the snooze/dim button (I can turn if off at night and when I want to know the time hit the dimmer! It only has one alarm, but that is OK for me. It has back up battery, and unlike past clocks that just save the time (cut the display off), this one keeps the display running and operations in tact (which is real nice). However, the best feature that is not advertised that much, is the inclusion of Apple iPod/iPhone inserts, in the past my alarm clocks, have not included the insert, and my iPhone 4 did not come with one (I have been using an iPhone 3G insert with the iPhone 4, for the longest (which is not really snug on the iPhone 4). The unit comes with the following inserts: iPhone 4, iPhone 3G (and 3GS), iPod Touch 4G (also iPod Nano 6G), iPod Nano 5G, and iPod Touch 2G. My only flaw with the device, is it does not have next/previous track buttons, you have to use the iPhone/iPod controls to go through your music, which is not that bad, but it would be a nice feature. It supports the app that keeps track of sleep, and alarms. However, I have found this app, tries to keep the display lit on the iPhone when in use, which is more light (and not good for me).
To let you know (I used an iPhone 4), unless you have the iPod playing all sounds (type clicking) and app sounds (like YouTube) are disabled and cannot be heard while docked (YouTube, can be played if you start a YouTube video and hit play on the alarm clock). However, the phone will ring (and vibrate) and texts and emails will vibrate only (no sound). -- This might be picky, but I wanted to let you know.
In the end, the alarm clock, has nice features and an easy to use system, with an easy to read and understand display with the best dimmer options (no light!!!), and everything you need to plug and play, oh, and also, you do not have to set the clock, it connects to the iPhone/iPod and pulls the time from the device (which is great for iPhone, since the time is synced with the carrier!)