Fuel Injecter flow testing services

anyone have experience with Fuel Injector flow testing - cleaning service that they would recommend?

here are a couple that I found on internet searches..

HPI 120lb injectors, 96lb injector, 250lb, Fits LS1, LS2, LS3, LS6

Fuel Injector Service -- Pro Flow | Ultrasonic fuel injector cleaning and flow testing specialists

It might be more cost effective to replace them with a matched set from these guys...

Custom OEM Fuel Injectors from FiveoMotorsport