Pretty good! :)

This is a useful app, especially if your real metronome switches floors and you dont feeling like going up or downstairs to get it. :P

Pros:
Keeps perfect time
Has a wide range of tempos that are easy to switch between (hit the plus and minus buttons or use the slider on the actual stick part of the metronome)
Easy start/stop (push the stick to start, touch the screen to stop)
Tons of meters- the basic ones like 3/4, 4/4, 2/4 and some more unusual ones-12 or 15 total meters
No adds! Opens right to the met and never has any once its open either

Cons:
Kinda quiet- occasionally hard to hear over an instrument (Ive used it with flute and piano)
No subdivisions, just a beat. Then again, with the huge range that it has you can just set it twice as fast in 2/4 for eighth notes

Its really good for an iPod app (especially a free one) but if youre gonna be doing anything really fast and/or loud, you may want to get a real metronome (a digital one) or go online and google online metronome.

booklover1217 about iMetronome (with quartz accuracy)