We only used two sets, both times the car wouldn't start. We had to run them through the injector bath twice before they came up good.
We had the same with a Bosch injector once also. That's why we clean all injectors before use now. They aren't bad injectors. Not a single injector on this planet can be cleaned and flowed, then sit for a month and still have its company guarantee its perfection.
We've never had lean out issues with the pencil type 1600's.
Any time we've had an injector issue with a Bosch injector (ID's included) they were fixed with a clean so we never had to return any.