The Integy motor dyno and Orion motor checker are pretty similar. Both allow you to adjust the voltage to the motor, making them useful for break in and driving a lathe as well as their motor checking functions. Both measure current draw and commutation ripple. The Integy also measures no-load RPM, the Orion does not.
Neither is an actual dyno in the true sense of the word, they don't apply any load to the motor and can't determine power output.
The only local shop around here that sells the Orion unit is asking $139... I'd be interested in hearing where it's available for $80. I could do without the Integy's no-load RPM readings for $50 less.