It's definitely a learning curve. I've had two DX-7s in my life, a DX-100, a TX-7, and multiple TX-81Zs.
If I were going to be in a rock band again, I'd want a DX-7. It's the ultimate rock band instrument. It's built like a tank, it does great crunchy organs, confident electric pianos. We were a four-piece band, with lead guitar, drums, and bass, so I didn't need the DX-7 for anything but keys. And I loved playing it, it was so fun.
About 20 years ago, I spent a long time perfecting a convincing acoustic piano sound that really sounded like a sampled acoustic piano in a rock-and-roll context, through the band's PA system. It involved a lot of velocity and envelope tricks, and I was really proud of it.