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The only adware it includes is a link to magnetmix.com, which is only visible while LimeWire is running. So it's not a problem :)
 
Though it may not have adware, many people have said that Limewire slows down your system alot. That is the only thing that I have really heard negatively about it...
 
That's probably a consequence of it being written in Java, not anything the programmers did wrong (except perhaps choosing that language to program in.)

Anyway, I've only used the apps on Linux, but I'd recommend aMule as a better alternative.
 
My guess is that the architecture of OSX makes spyware a lot harder to write, because an app doesn't run with root privileges.

Anyway, I've used both Limewire and Acquisition and have been happy with both.
 
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