Great and easy to use little helper. Works fine with OS X 10.4.3 and 1130 addresses without speed problems (I use the tone dialing). Compared to JPT I love the interactive connection with Apple's Addressbook like calling from the context menu. Great is also the opportunity to dial any number from the clipboard, so one can use wih any kind of number collection whatsoever.
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For German users some additional prefix opportunities would be great (as many people use different call by call dialers for various kind of calls, like local, long distance, inernational, national mobile, international mobile). And ABdialer can change the volume of the loudspeakers for every call, but not activate the speakers if there are in silent mode.