Seas H1397-04 (27TAFNC/D) 1 inch Aluminum Dome Tweeter Review is now up on my site.
For $43/each this is a pretty solid driver. Super compact. Nice FR (rising on the top end; may want to aim closer to 30 degrees off-axis depending on the car's influence). Distortion below 2khz is high but a crossover will help that. Above 5khz distortion is a bit higher than I'd care for but it's not terrible. Overall I think this is a pretty good value.