Hi etap, Iola are the System Mechanic guys and I have used it in the past - No problems. I'm wary of Registry cleaners being used unnecessarily and most of the Moderators here don't advise them unless you have viruses/trojans/malware, and then you follow instructions for cleaning your HD
It's a matter of your choice really where you'll get the best bang for your bucks. If the software has a complete Anti-Virus program included - this may be your answer. Cheers Neil.