We took the Brightline from MCO to Miami back in May, just to experience it. We enjoyed it and wouldn't hesitate to do it again.
Here are a few of my tips/tricks.
1. Book early. They do sell out, and the closer they get to full, the higher the prices are.
2. When you are getting close to your stop, start getting yourself ready to get off. The stops at the locations between MCO and MIA were REALLY quick.
3. The pricing during different times of the day can vary greatly. We got our Premium seats for $99 for our time slot, but other times of the day it would've been $200+.
4. It is a train and it does have a little bit of motion to it, but not too bad. If you are prone to motion sickness, come prepared.
5. There are some luggage storage spaces on each car for you to store your larger luggage, but it's a first-come first-serve situation. So, you might want to check your bag, just to be on the safe side.
6. Evaluate the Premium pricing and what you get for the extra cost. It includes a checked bag, so if you need to check a bag, you might be just as well off to get the Premium seat. I was glad to have access to the Premium lounge at the MCO airport. The rest of the waiting area was getting pretty full.
7. The bathrooms are outside of the Premium Lounge area, so make sure to bring your ticket with you so you can get back in.
8. We flew into MCO in the morning and took the APM from terminal A/B to C. It was a really easy process and the Brightline terminal is really close to the APM station in terminal C.
9. The food/beverage/snack options that were included with Premium were solid choices. Since we flew in that same day, we relied on the food/beverage/snack options for our meals/snacks. I feel like we got our money's worth by doing the premium upgrade.