If you get responses to this, they will be interesting.
The tomiki school is a branch of aikido that emphasizes competition. Some of it is in demonstrating aikido techniques on an attacker, and some of it is like judo randori.
A friend of mine who studied aikido for years said that most aikidoka spoke badly of the tomiki group, and that their techniques were "bad judo tricks, masquerading as aikido." Strong words.
Unfortunately, I do not know any tomiki practitioners personally, so I cannot give their side adequately. I can say, however, that they are trying to restore resistance and competitive practices to aikido, which are something that enhance the combat effectiveness of any art. Whether their actual approach is successful in this endeavor is an issue I am not well-enough informed on to comment about. Often it really just creates an artificial ennvironment relying on "tricks" over effective techniques. However, if the goal is effectiveness, sometimes the tricks win out.
~TT