Found these reviews on a review site for the Brindley Place Car Park
Review 1
Close by to the likes of the Sea Life Centre, Brindley Place restaurants and bars, Bannatynes Spa and Broad Street this is a perfect car park location.
I agree with the other reviewers though, avoid this car park like the plague if there are any events going on at the NIA. The car park gets grid locked and a result you can't get out! I actually ended up going for a meal as a result to kill a few hours.
Review 2
Alas, it has a fundamental flaw. And I say this having once spent 2.5 hours trying to exit it. It was HELL. We left a show at the Crescent Theatre at the exact same time as thousands of people leaving a Peter Kay show at the nearby NIA.
We were parked on the third floor and it took us nearly three hours to make it down to ground level. Car park staff offered no explanation and they didn't offer any compensation as we left.
Essentially, we paid £8.60 to sit in a traffic jam - though I did nip out of the car to buy Ribena and a Ginsters. It was a horrid experience (Ribena and pasty aside). As a result, I now hate this car park, Peter Kay and people who pay to go and see Peter Kay.
Park there by all means (it is a nice car park), just make sure you time your exit not to clash with kicking out time at the NIA
Web site
http://www.yelp.co.uk/biz/brindley-place-canalside-car-park-birmingham