So I think it just depends. I had a 2016 Mercedes with it, and it was the slowest thing in the world - I would parallel park myself twice in the time it took to do it once. But now I have a 2020 Volvo XC60 and it's very fast and reliable, I have no issues using it even in heavy traffic , it doesn't feel like I'm holding up people while parking.

Get a Tesla, my 2015 Model S is easily faster then me, especially if the space is only just big enough. The first time I tried it I was so surprised by how quick it was that I stamped on the brake!