I went to my first Hapkido class today. I have a very good (and respected) friend from work, who is already taking that class and he recommended it.
I had high hopes for that class, maybe a little too high. It was a little bit underwhelming due to my overtly hyped expectations. It is definitely more exerting (physically) than Aikido. It combines the kicks from Taekwondo with the joint locks in Aikido. So I'm excited to keep learning the art. But the part that bothers me about Hapkido is you attack to destroy, unlike Aikido where you take care of your opponent even when you are pinning them down and making them submit.
But one great thing about the class is the instructor seems really good. He is very friendly and knowledgeable. If you are in Lehi/American Fork area you should check out the class. xsifactory.com/martial-arts-classes/