I train in both karate and aikido. my roots are in shotokan karate in which I have attained 2nd dan. for the 6/7 years I have been training in aiki jujutsu and I must say that I love both styles, they both have great attributes.
I attend aiki jujutsu twice a week and in my spare time practice my pad-bag work and kata and anylise kata applications with a fellow karateka, I have found many aikido techniques within kata- I find this very beneficial for both arts.
I practice my gross motor skills and karate for attacking and aiding muscle memory which provides good body mechanics, hip power, flexibillity, this also benefits my aikido training.
aikido is more of a complex art and takes more time and dedication to learn, it is a great art and well worth continuing and progressing with. I think it is always good to do research into other arts and pick up tips or extra techniques which you can add to your arsenal of knowledge, plus you get an idea of what others are doing, however it is true what others say in being 'a master of none' and is good advice.