We have spend a ridiculous amount on testing and don't regret it.
Ditto.
Comprehensive testing provides a ton of valuable information and understanding. It also puts a very helpful barrier of objective data between you and kid. Even when we weren't told anything we didn't already know, we were able to step back and much more calmly deal with behaviours (whether gifted or slow processing/ writing) as the "can't" they are, and not the "won't" they so often feel like.
That said, I wouldn't rush into testing unless you have current need, or see current problems. We've had to do multiple rounds with our 2E kids because their additional exceptionalities were just too well compensated and masked when they were younger, so we weren't yet asking the right questions.
