We went there on our way to Wellington in late afternoon. The place was huge with additional basement to visit. We were almost by ourselves as there wasn't much visitors in that afternoon. It was fun seeing how the cars evolved over the decades with some weird designs and car logos. The cars were parked in hundreds to thousand.
The entry price at $10 is pretty affordable. Anyone who are on their way to or from Wellington passing by SH1 state highway should pay a visit for an enjoyable day.