Pros
NI's culture is second to none. Depending on your team, the flexibility offered is great for a work-life balance and people are friendly and willing to go the extra mile for you. The projects remain challenging for me even after all these years, and the benefits (non-salary) are still great. The stability and not having to worry about losing your job is always valuable.
Cons
Salary is universally the top complaint at NI. They simply do not compensate the masses well, or to performance. There are a select few, particularly management positions, that get paid above market. But everyone else, gets a pat on the back, and a "Good Job!", but no corresponding acknowledgement when it comes to compensation. It is frustrating to be told over and over and over again that you are doing a great job but as you're already paid relatively well compared to your peers, you won't receive a raise, or you will only receive a negligible amount. There are only so many time this can happen before people quit, and that is evident in the past few years where employees are starting to take flight. NI has lately become a great place to cut your teeth, gain valuable experience and then move on to top paying jobs elsewhere, instead of being a long term employer as it used to be.