Has anyone had fuel injectors professionally cleaned & tested?

I'm formulating the gameplan for replacing my engine wiring harness. Since I'm removing the intake manifold, it seems like a convenient time to replace injector seals. And since I'm pulling them off to replace the seals, why not clean & test them?

I've read the procedure for testing them by letting them squirt into a mason jar. Umm, I'll pass. That sounds like a good recipe for a fiery experience.

It looks like the cost of getting them professionally cleaned & tested runs about 1/4 of what it'd cost to buy 4 new ones (~$100). Has anyone done this? Did you have it done locally or mail order? Did you feel it was worth it or should I save my pennies a little longer and spend $400 on new injectors?

Thanks!