Couple of thoughts:
Yes Diki hit it. For live performance its all about the vocals !

Update on my misguided interest in the Roland FP e50.. Yes you can add new Styles from Roland. I'm not sure of the complete process but there are others available, although with the variety already given I don't think I would need them.
And you can edit the Styles parts. Change instruments, volume and mute.
No Mark Jump feature. That's a big omission.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer