A couple weeks ago I was chatting with an acquaintance who has been experimenting with electrifying recumbent bicycles and sometimes selling electrified recumbents. He's been using the Heinnemann hub motor for a long time and he told me that 2-3 months ago he got a Crystalyte 5xx series motor to try out.
He lives in Palo Alto and something he's been doing is to push the boundaries of how far his bicycle will take him. One goal he has is to make a trip to Santa Cruz using his bicycle. He's done lots of long distance rides and could ride the number of miles between his home and Santa Cruz, however there is an extensive mountain range in-between. Palo Alto and Santa Cruz are both at sea level, and the mountains in-between have peaks between 1500-2500 feet depending on the route you choose across. On our side of the mountains the land is pretty flat until you get to the base of the mountain, and then it's a pretty straight climb up to the summit. FWIW this mountain range is formed by the infamous San Andreas Fault.
He described some tests he'd done to ride to the top of the mountain. Using dual Heinnemann motors on a recumbent it took an hour to ride to the top of the mountain. The Heinnemann motors overheat pretty easily and shut down, so this hour takes into account stops to let the motor cool down. However with the Crystalyte motor it took him 11 minutes to ride to the top, no need to stop. The route he took is a 1000+ foot climb up Page Mill Rd.
This situation is one of the few instances where regenerative braking starts to make sense. On the ride down the mountain there's a question of how to keep your speed reasonably safe, and rather than keeping the brakes on you could use regen. But I don't know of any bicycle motors that allow for regen...?