Make sure you check the credintials of the instructor. Although you should be okay, there are people out there who claim to be teaching Aikido who can show no proof of their rank or lineage back to the founder. I studied at on Dojo where the instructor claimed to have studied under a direct decendent of O' Sensei, but had no rank certificate, nor could he even tell where the sensei was now. After checking in AikiFaq as well as through other sources, the instructors sensei seems to not even exist! There are people out there who will claim they are doining Aikido because it is popular and there may not be anyone who can refute what they are doing as being Aikido or not.