The duration of max. speed is pitfully short - maybe 40 secs IIRC. That said, the Shanghai maglev at 430kph feels nothing at all like an ICE at 300kph or an aircraft at 900kph. There's lots of sharp side to side movements and low frequency noise. Depending on your final destination the maglev may be a reasonable solution, but for many it's just a novelty because they need to get into a taxi to continue a journey. In which case, wait for 430kph or don't bother at all, IMO.