Pros: Better GUI than limewire (one of the prettiest?) and you don't have to wait till the file is fully DL'd before realising it's spam, click on the download and it will reveal what it is (unlike Limewire, where you have to resort to navigating to the partialDL folder and seeing what's in there). Also takes up vastly less CPU and RAM. VERY impressed with this side of things......BUT..........
Cons: I always seem to get more results on Limewire ?????? .....which is odd seeing as they are both using the gnutella network
You also cannot specify to just look for (for example) programs. I'm afraid that you really can't. Acquisition will STILL look for everything and the filter just filters the results you SEE, it's STILL searching in all the categories (for instance, typing up toast will search for ALL toast files)....Limewire on the other hand, is able to search in the one category you pick ALONE rather than search everything but only SHOW you one category (so acquisition's not as focused as limewire here).
Or put it another way, with filter "prog files" on; Limewire will ONLY search for prog files, giving you a quicker result (it won't even register other file types...very focused searching); whereas acquisition will register ALL files, but only DISPLAY the prog files....it's still searching for everything though (it still wades through ALL the files with that name).....slower to find things and less streamlined. (Limewire does a true search filter, acquisition is merely a display filter, nothing else).
Thirdly, tends to crash on shutdown a lot (unlike limewire). So much so, that this issue is even a permanent fixture in the help/faq section (you have to trash a file in the lib, which means you have to enter your serial number again and again). :( .....not too impressive on this side of things then.
Having used this a bit more I have to say that the "crashing on app shutdown" is SO recurrent that it reminds me of a windows program :)
Fourthly, tries to secretly "phone home" (use little snitch to prevent this).
Number Five, AcqLite is like Acquisition but free.....use that instead.
Number Six, the NagWare side of things is VERY annoying (again, Acqlite to the rescue here).
OVERALL, if all you're interested in is a pretty GUI, go for it.
However, if you also want an app from a developer with the honesty to keep his promises (eg re:updates and costs as mentioned below), and that DOESN'T act like a broken windoze app or malware, then stay well clear.
There are other apps that do this better and for free...Caveat Emptor.