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Pacemaker's Editor software is intuitive and straightforward, but also has some good functions (a basic hi-lo filter and effects). Unfortunately, it also falls down on two big counts. It does not read all my music files - which admittedly are in sundry random formats - and (while it allows you to upload your mix to the Pacemaker website) it cannot export/render a mix as an audio file, for simple burning.
There is probably a workaround with FL Studio, but my skills with this software are less rude than rudimentary (and it is designed for arrangement, rather than live mixing).
Ableton Live seems ideal, but complex and pricy and I took one look at the Traktor interface and nearly wept.
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I like the fact that the waveform is visible - and arranged one channel over the other, so that it's easy to see whether or not the beats match - and the interface is uncluttered. I dislike too many nobs and switches.
Wish me luck.