It downloaded by itself, didn't uninstall but launched about 50 viruses.
It always pops on eBay which at first made me want to remove it but then I noticed it was actually giving me better prices a lot of the time... not bad
Dealply is a nice addon. It gets a little annoying with the amount of pop ups every once in a while but all in all it's pretty useful.
Been using this for almost a month now. I do a lot of online shopping and I can't really think of the last time this HASN'T helped me find a deal...