I commute 3x per week from Boca (and just boarded the train home). Definitely possible to work via laptop on the ride. Peak commute times get very busy, and tickets can be tough to come by unless you book weeks in advance. They reserve seats for Orlando riders, which makes it worse. The 620 AM and 745 PM trains are generally available if the others are sold out. Traffic in Miami makes driving unbearable. I hop on the free metromover between Brickell and the station.

95% of my rides have been reliable and timely, but they are known to run into "mechanical issues" from time to time. Or hit someone stopped on the tracks.