Also if you play VAC enabled games they could potentially see this as a 'hack' or unauthorized program and get you a VAC ban. The amount of time it takes to get a card drop is increased when more than one game is running. Just do not use it while palying another game. This is from the same guy who makes Enhanced Steam and Steam Invite Spam Filter.
Also this Steam Group would most likely be removed if IM was unsafe. The source code is openly available so if anything was malicious it would have been found a long time ago.
Just make sure you download it from his websites. While I am not an admin here I do post frequently here to try to help.
